Form 8-K
8-K — SOUTHERN CO
Accession: 0000092122-26-000060
Filed: 2026-08-04
Period: 2026-08-03
CIK: 0000092122
SIC: 4911 (ELECTRIC SERVICES)
Item: Other Events
Item: Financial Statements and Exhibits
Documents
8-K — so-20260803.htm (Primary)
EX-99.1 (ex99-1southern2026a2026bco.htm)
GRAPHIC (image_0.jpg)
XML — IDEA: XBRL DOCUMENT (R1.htm)
8-K
8-K (Primary)
Filename: so-20260803.htm · Sequence: 1
so-20260803
0000092122FALSE00000921222026-08-032026-08-030000092122us-gaap:CommonStockMember2026-08-032026-08-030000092122so:Series2017B5.25JuniorSubordinatedNotesDue2077Member2026-08-032026-08-030000092122so:Series2020A4.95JuniorSubordinatedNotesDue2080Member2026-08-032026-08-030000092122so:Series2020C420JuniorSubordinatedNotesDue2060Member2026-08-032026-08-030000092122so:Series2021B1875FixedToFixedResetRateJuniorSubordinatedNotesDue2081Member2026-08-032026-08-030000092122so:Series2025A6.50JuniorSubordinatedNotesDue2085Member2026-08-032026-08-030000092122so:A2025SeriesACorporateUnitsMember2026-08-032026-08-03
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D. C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported) August 3, 2026
Commission
File Number Registrant,
State of Incorporation,
Address and Telephone Number I.R.S. Employer
Identification No.
1-3526 The Southern Company 58-0690070
(A Delaware Corporation)
30 Ivan Allen Jr. Boulevard, N.W.
Atlanta, Georgia 30308
(404) 506-5000
The name and address of the registrant have not changed since the last report.
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
☐
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Registrant Title of each class Trading
Symbol(s) Name of each exchange
on which registered
The Southern Company Common Stock, par value $0.01 per share SO New York Stock Exchange
The Southern Company Series 2017B 5.25% Junior Subordinated Notes due 2077 SOJC New York Stock Exchange
The Southern Company Series 2020A 4.95% Junior Subordinated Notes due 2080 SOJD New York Stock Exchange
The Southern Company
Series 2020C 4.20% Junior Subordinated Notes due 2060
SOJE New York Stock Exchange
The Southern Company Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081 SO 81 New York Stock Exchange
The Southern Company Series 2025A 6.50% Junior Subordinated Notes due 2085 SOJF New York Stock Exchange
The Southern Company 2025 Series A Corporate Units SOMN New York Stock Exchange
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 8.01.
Other Events.
On August 3, 2026, The Southern Company (the “Company”) issued a press release announcing the upsize and pricing of offerings of $725 million aggregate principal amount of its Series 2026A 2.125% Convertible Senior Notes due December 15, 2027 (the “Series 2026A Convertible Notes”) and $1.65 billion aggregate principal amount of its Series 2026B 3.50% Convertible Senior Notes due September 15, 2029 (the “Series 2026B Convertible Notes” and, together with the Series 2026A Convertible Notes, the “Convertible Notes”) in private offerings to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended, reflecting an upsize of $75 million over the previously announced offering size of the Series 2026A Convertible Notes and $150 million over the previously announced offering size of the Series 2026B Convertible Notes. In addition, the Company granted the initial purchasers options to purchase, for settlement within a period of 13 days from, and including, the date the Convertible Notes are first issued, up to an additional $108.75 million aggregate principal amount of the Series 2026A Convertible Notes and up to an additional $247.5 million aggregate principal amount of the Series 2026B Convertible Notes.
Contemporaneously with the pricing of the Convertible Notes, the Company entered into separate and privately negotiated transactions with a limited number of holders of its Series 2024A 4.50% Convertible Senior Notes due June 15, 2027 (the “Series 2024A Convertible Notes”) to repurchase approximately $369 million aggregate principal amount of the Series 2024A Convertible Notes.
A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.
Item 9.01.
Financial Statements and Exhibits.
(d) Exhibits.
99.1
Press Release issued by the Company on August 3, 2026 announcing the upsize and pricing of the Convertible Notes.
104 Cover Page Interactive Data File – The cover page iXBRL tags are embedded within the inline XBRL document.
2
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: August 3, 2026 THE SOUTHERN COMPANY
By /s/Melissa K. Caen
Melissa K. Caen
Assistant Secretary
3
EX-99.1
EX-99.1
Filename: ex99-1southern2026a2026bco.htm · Sequence: 2
Document
Exhibit 99.1
News
Media Contact: Southern Company Media Relations
404-506-5333 or 1-866-506-5333
Investor Relations Contact:
Greg MacLeod
404-685-4194
gbmacleo@southernco.com
Southern Company announces upsize and pricing of $725 million in aggregate principal amount of Series 2026A 2.125% Convertible Senior Notes due December 15, 2027 and $1.65 billion in aggregate principal amount of Series 2026B 3.50% Convertible Senior Notes due September 15, 2029
ATLANTA, August 3, 2026 – Southern Company (NYSE: SO) today announced the pricing of $725 million in aggregate principal amount of its Series 2026A 2.125% Convertible Senior Notes due December 15, 2027 (the “Series 2026A Convertible Notes”) and $1.65 billion in aggregate principal amount of its Series 2026B 3.50% Convertible Senior Notes due September 15, 2029 (the “Series 2026B Convertible Notes” and, together with the Series 2026A Convertible Notes, the “Convertible Notes”) in private placements to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”), reflecting upsizes of $75 million and $150 million over the previously announced offering sizes for the Series 2026A Convertible Notes and the Series 2026B Convertible Notes, respectively. In addition, Southern Company granted the initial purchasers of the Convertible Notes options to purchase, for settlement within a period of 13 days from, and including, the date the Convertible Notes are first issued, up to an additional $108.75 million in aggregate principal amount of the Series 2026A Convertible Notes and an additional $247.5 million in aggregate principal amount of the Series 2026B Convertible Notes. The offerings are expected to close on August 6, 2026, subject to customary closing conditions.
Interest on the Convertible Notes will be paid semiannually at a rate of 2.125% per annum (in the case of the Series 2026A Convertible Notes) and 3.50% per annum (in the case of the Series 2026B Convertible Notes). The Series 2026A Convertible Notes will have an initial conversion rate of 9.5641 shares of Southern Company’s common stock per $1,000 principal amount of the Series 2026A Convertible Notes (which is equal to an initial conversion price of approximately $104.56 per share of common stock), representing an initial conversion premium of approximately 12.5% above the last reported sale price of Southern Company’s common stock on August 3, 2026. The Series 2026B Convertible Notes will have an initial conversion rate of 8.4389 shares of Southern Company’s common stock per $1,000 principal amount of the Series 2026B Convertible Notes (which is equal to an initial conversion price of approximately $118.50 per share of common stock), representing an initial conversion premium of
approximately 27.5% above the last reported sale price of Southern Company’s common stock on August 3, 2026. These conversion rates are subject to adjustment in certain circumstances. The Convertible Notes will mature on December 15, 2027 (in the case of the Series 2026A Convertible Notes) and September 15, 2029 (in the case of the Series 2026B Convertible Notes), unless earlier repurchased or converted in accordance with their terms.
Prior to September 15, 2027 (in the case of the Series 2026A Convertible Notes) or June 15, 2029 (in the case of the Series 2026B Convertible Notes), the Convertible Notes will be convertible only upon the occurrence of certain events and during certain periods. From and after September 15, 2027 (in the case of the Series 2026A Convertible Notes) or June 15, 2029 (in the case of the Series 2026B Convertible Notes), the Convertible Notes will be convertible at any time until the close of business on the second scheduled trading day immediately preceding the maturity date of the applicable series of Convertible Notes. Upon conversion, Southern Company will pay cash up to the aggregate principal amount of the Convertible Notes of the applicable series to be converted and pay or deliver, as the case may be, cash, shares of Southern Company’s common stock, or a combination of cash and shares of common stock, at Southern Company’s election, in respect of the remainder, if any, of Southern Company’s conversion obligation in excess of the aggregate principal amount of the Convertible Notes of the applicable series being converted.
Southern Company estimates that the net proceeds from the offering of the Series 2026A Convertible Notes will be approximately $721 million (or approximately $829 million if the initial purchasers exercise their option to purchase additional Series 2026A Convertible Notes in full), after deducting estimated initial purchasers’ discounts and estimated offering expenses payable by Southern Company. Southern Company estimates that the net proceeds from the offering of the Series 2026B Convertible Notes will be approximately $1.63 billion (or approximately $1.88 billion if the initial purchasers exercise their option to purchase additional Series 2026B Convertible Notes in full), after deducting estimated initial purchasers’ discounts and estimated offering expenses payable by Southern Company. Southern Company intends to use approximately $403 million of the net proceeds from these offerings to repurchase approximately $369 million aggregate principal amount of its Series 2024A 4.50% Convertible Senior Notes due June 15, 2027 (the “Series 2024A Convertible Notes”) through individually negotiated transactions with a limited number of holders thereof (each, a “note repurchase transaction”), effected through one of the initial purchasers of the Convertible Notes or its affiliate. Southern Company intends to use the remaining net proceeds to repay all or a portion of its outstanding short-term debt and for other general corporate purposes, which may include investment in its subsidiaries.
Contemporaneously with the pricing of the Convertible Notes, Southern Company entered into separate and privately negotiated transactions with a limited number of holders of the Series 2024A Convertible Notes to use a portion of the proceeds of the offerings to repurchase a portion of the Series 2024A Convertible Notes, as described above, on terms negotiated with each such holder. The terms of each note repurchase transaction were individually negotiated
with each such holder of the Series 2024A Convertible Notes and depended on several factors, including the market price of Southern Company’s common stock and the trading price of the Series 2024A Convertible Notes at the time of each such note repurchase. Southern Company may also repurchase outstanding Series 2024A Convertible Notes following the completion of the offerings of the Convertible Notes. No assurance can be given as to how much, if any, of the Series 2024A Convertible Notes will be repurchased following the completion of the offerings or the terms on which they will be repurchased.
Southern Company expects that holders of the Series 2024A Convertible Notes that sell their Series 2024A Convertible Notes to Southern Company in any note repurchase transaction may enter into or unwind various derivatives with respect to Southern Company’s common stock and/or purchase or sell shares of Southern Company’s common stock in the market to hedge their exposure in connection with these transactions. In particular, Southern Company expects that many holders of the Series 2024A Convertible Notes employ a convertible arbitrage strategy with respect to the Series 2024A Convertible Notes and have a short position with respect to Southern Company’s common stock that they would close, through purchases of Southern Company’s common stock and/or the entry into or unwind of economically equivalent derivatives transactions with respect to Southern Company’s common stock, in connection with Southern Company’s repurchase of their Series 2024A Convertible Notes for cash. This activity could increase (or reduce the size of any decrease in) the market price of Southern Company’s common stock or the Convertible Notes at that time and could result in higher effective conversion prices for the Convertible Notes.
This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall there be any sale of these securities in any jurisdiction in which such an offer, solicitation or sale would be unlawful. The offer and sale of the Convertible Notes and the shares of common stock issuable upon conversion of the Convertible Notes, if any, have not been, and will not be, registered under the Securities Act or the securities laws of any other jurisdiction, and the Convertible Notes and such shares of common stock may not be offered or sold without registration or an applicable exemption from registration requirements.
About Southern Company
Southern Company (NYSE: SO) is a leading energy provider serving 9 million customers across the Southeast and beyond through its family of companies. The company has electric operating companies in three states, natural gas distribution companies in four states, a competitive generation company, a leading distributed energy distribution company with national capabilities, a fiber optics network and telecommunications services.
Cautionary Notice Regarding Forward-Looking Statements
Certain information contained in this release is forward-looking information based on current expectations and plans that involve risks and uncertainties. Forward-looking information
includes, among other things, statements concerning the closing of the offerings of the Convertible Notes, the expected use of proceeds from the offerings and the note repurchase transactions. Southern Company cautions that there are certain factors that can cause actual results to differ materially from the forward-looking information that has been provided. The reader is cautioned not to put undue reliance on this forward-looking information, which is not a guarantee of future performance and is subject to a number of uncertainties and other factors, many of which are outside the control of Southern Company; accordingly, there can be no assurance that such suggested results will be realized. The following factors, in addition to those discussed in Southern Company’s Annual Report on Form 10-K for the year ended December 31, 2025, Quarterly Reports on Form 10-Q for the quarters ended March 31, 2026 and June 30, 2026 and subsequent securities filings, could cause actual results to differ materially from management expectations as suggested by such forward-looking information: global and U.S. economic conditions, including impacts from geopolitical conflicts, recession, inflation, changes in trade policies (including tariffs and other trade measures) of the United States and other countries, interest rate fluctuations and financial market conditions, and the results of financing efforts; access to capital markets and other financing sources; changes in Southern Company's credit ratings; and catastrophic events such as fires, including wildfires, land movement, earthquakes, explosions, floods, high winds, tornadoes, hurricanes and other storms, solar flares, droughts, future epidemic or pandemic health events, wars, political unrest or other similar occurrences. Southern Company expressly disclaims any obligation to update any forward‐looking information.
###
GRAPHIC
GRAPHIC
Filename: image_0.jpg · Sequence: 7
Binary file (46510 bytes)
Download image_0.jpg
XML — IDEA: XBRL DOCUMENT
XML
Filename: R1.htm · Sequence: 9
v3.26.1
Cover Page Document
Aug. 03, 2026
Document Information [Line Items]
Document Type
8-K
Document Period End Date
Aug. 03, 2026
Entity File Number
1-3526
Entity Registrant Name
The Southern Company
Entity Tax Identification Number
58-0690070
Entity Incorporation, State or Country Code
DE
Entity Address, Address Line One
30 Ivan Allen Jr. Boulevard, N.W
Entity Address, City or Town
Atlanta
Entity Address, State or Province
GA
Entity Address, Postal Zip Code
30308
City Area Code
404
Local Phone Number
506-5000
Written Communications
false
Soliciting Material
false
Pre-commencement Tender Offer
false
Pre-commencement Issuer Tender Offer
false
Entity Emerging Growth Company
false
Entity Central Index Key
0000092122
Amendment Flag
false
Common Stock, par value $0.01 per share
Document Information [Line Items]
Title of 12(b) Security
Common Stock, par value $0.01 per share
Trading Symbol
SO
Security Exchange Name
NYSE
Series 2017B 5.25% Junior Subordinated Notes due 2077
Document Information [Line Items]
Title of 12(b) Security
Series 2017B 5.25% Junior Subordinated Notes due 2077
Trading Symbol
SOJC
Security Exchange Name
NYSE
Series 2020A 4.95% Junior Subordinated Notes Due 2080 [Member]
Document Information [Line Items]
Title of 12(b) Security
Series 2020A 4.95% Junior Subordinated Notes due 2080
Trading Symbol
SOJD
Security Exchange Name
NYSE
Series 2020C 4.20% Junior Subordinated Notes due 2060
Document Information [Line Items]
Title of 12(b) Security
Series 2020C 4.20% Junior Subordinated Notes due 2060
Trading Symbol
SOJE
Security Exchange Name
NYSE
Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081
Document Information [Line Items]
Title of 12(b) Security
Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081
Trading Symbol
SO 81
Security Exchange Name
NYSE
Series 2025A 6.50% Junior Subordinated Notes due 2085
Document Information [Line Items]
Title of 12(b) Security
Series 2025A 6.50% Junior Subordinated Notes due 2085
Trading Symbol
SOJF
Security Exchange Name
NYSE
2025 Series A Corporate Units
Document Information [Line Items]
Title of 12(b) Security
2025 Series A Corporate Units
Trading Symbol
SOMN
Security Exchange Name
NYSE
X
- Definition
Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.
+ References
No definition available.
+ Details
Name:
dei_AmendmentFlag
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Area code of city
+ References
No definition available.
+ Details
Name:
dei_CityAreaCode
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details
Name:
dei_DocumentInformationLineItems
Namespace Prefix:
dei_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.
+ References
No definition available.
+ Details
Name:
dei_DocumentPeriodEndDate
Namespace Prefix:
dei_
Data Type:
xbrli:dateItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.
+ References
No definition available.
+ Details
Name:
dei_DocumentType
Namespace Prefix:
dei_
Data Type:
dei:submissionTypeItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Address Line 1 such as Attn, Building Name, Street Name
+ References
No definition available.
+ Details
Name:
dei_EntityAddressAddressLine1
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the City or Town
+ References
No definition available.
+ Details
Name:
dei_EntityAddressCityOrTown
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Code for the postal or zip code
+ References
No definition available.
+ Details
Name:
dei_EntityAddressPostalZipCode
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the state or province.
+ References
No definition available.
+ Details
Name:
dei_EntityAddressStateOrProvince
Namespace Prefix:
dei_
Data Type:
dei:stateOrProvinceItemType
Balance Type:
na
Period Type:
duration
X
- Definition
A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityCentralIndexKey
Namespace Prefix:
dei_
Data Type:
dei:centralIndexKeyItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Indicate if registrant meets the emerging growth company criteria.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityEmergingGrowthCompany
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.
+ References
No definition available.
+ Details
Name:
dei_EntityFileNumber
Namespace Prefix:
dei_
Data Type:
dei:fileNumberItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Two-character EDGAR code representing the state or country of incorporation.
+ References
No definition available.
+ Details
Name:
dei_EntityIncorporationStateCountryCode
Namespace Prefix:
dei_
Data Type:
dei:edgarStateCountryItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityRegistrantName
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityTaxIdentificationNumber
Namespace Prefix:
dei_
Data Type:
dei:employerIdItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Local phone number for entity.
+ References
No definition available.
+ Details
Name:
dei_LocalPhoneNumber
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 13e
-Subsection 4c
+ Details
Name:
dei_PreCommencementIssuerTenderOffer
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14d
-Subsection 2b
+ Details
Name:
dei_PreCommencementTenderOffer
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Title of a 12(b) registered security.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b
+ Details
Name:
dei_Security12bTitle
Namespace Prefix:
dei_
Data Type:
dei:securityTitleItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the Exchange on which a security is registered.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection d1-1
+ Details
Name:
dei_SecurityExchangeName
Namespace Prefix:
dei_
Data Type:
dei:edgarExchangeCodeItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14a
-Subsection 12
+ Details
Name:
dei_SolicitingMaterial
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Trading symbol of an instrument as listed on an exchange.
+ References
No definition available.
+ Details
Name:
dei_TradingSymbol
Namespace Prefix:
dei_
Data Type:
dei:tradingSymbolItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Securities Act
-Number 230
-Section 425
+ Details
Name:
dei_WrittenCommunications
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Details
Name:
us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type:
X
- Details
Name:
us-gaap_StatementClassOfStockAxis=so_Series2017B5.25JuniorSubordinatedNotesDue2077Member
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type:
X
- Details
Name:
us-gaap_StatementClassOfStockAxis=so_Series2020A4.95JuniorSubordinatedNotesDue2080Member
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type:
X
- Details
Name:
us-gaap_StatementClassOfStockAxis=so_Series2020C420JuniorSubordinatedNotesDue2060Member
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type:
X
- Details
Name:
us-gaap_StatementClassOfStockAxis=so_Series2021B1875FixedToFixedResetRateJuniorSubordinatedNotesDue2081Member
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type:
X
- Details
Name:
us-gaap_StatementClassOfStockAxis=so_Series2025A6.50JuniorSubordinatedNotesDue2085Member
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type:
X
- Details
Name:
us-gaap_StatementClassOfStockAxis=so_A2025SeriesACorporateUnitsMember
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type: