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Segment and Related Information
 6 Months Ended
Jun. 30, 2024
Segment Reporting [Abstract]  
Segment and Related Information SEGMENT AND RELATED INFORMATION
Southern Company
The primary businesses of the Southern Company system are electricity sales by the traditional electric operating companies and Southern Power and the distribution of natural gas by Southern Company Gas. The traditional electric operating companies are vertically integrated utilities providing electric service in three Southeastern states. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy and battery energy storage projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through its natural gas distribution utilities and is involved in several other complementary businesses including gas pipeline investments and gas marketing services.
Southern Company's reportable business segments are the sale of electricity by the traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. Revenues from sales by Southern Power to the traditional electric operating companies were $86 million and $179 million for the three and six months ended June 30, 2024, respectively and $116 million and $251 million for the three and six months ended June 30, 2023, respectively. Revenues from sales of natural gas from Southern Company Gas to the traditional electric operating companies and Southern Power were immaterial for all periods presented. The "All Other" column includes the Southern Company parent entity, which does not allocate operating expenses to business segments. Also, this category includes segments below the quantitative threshold for separate disclosure. These segments include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications. All other inter-segment revenues are not material.
Financial data for business segments and products and services for the three and six months ended June 30, 2024 and 2023 was as follows:
Electric Utilities
Traditional
Electric Operating
Companies		Southern
Power		EliminationsTotalSouthern Company GasAll
Other		EliminationsConsolidated
(in millions)
Three Months Ended June 30, 2024
Operating revenues$5,025 $524 $(93)$5,456 $831 $222 $(46)$6,463 
Segment net income (loss)(a)(b)
1,192 86 — 1,278 108 (181)(2)1,203 
Six Months Ended June 30, 2024
Operating revenues$9,463 $997 $(189)$10,271 $2,538 $383 $(83)$13,109 
Segment net income (loss)(a)(b)
2,012 182 — 2,194 517 (368)(11)2,332 
At June 30, 2024
Goodwill$— $2 $— $2 $5,015 $144 $— $5,161 
Total assets102,528 12,764 (586)114,706 25,055 2,828 (652)141,937 
Three Months Ended June 30, 2023
Operating revenues$4,359 $525 $(120)$4,764 $852 $180 $(48)$5,748 
Segment net income (loss)(a)(c)
823 85 — 908 85 (157)2 838 
Six Months Ended June 30, 2023
Operating revenues$8,472 $1,033 $(258)$9,247 $2,728 $346 $(93)$12,228 
Segment net income (loss)(a)(c)(d)
1,433 187 — 1,620 393 (311)(2)1,700 
At December 31, 2023
Goodwill$— $2 $— $2 $5,015 $144 $— $5,161 
Total assets100,429 12,761 (545)112,645 25,083 2,446 (843)139,331 
(a)Attributable to Southern Company.
(b)For the traditional electric operating companies, includes a pre-tax credit to income at Georgia Power related to the estimated probable loss associated with the completion of Plant Vogtle Units 3 and 4 of $21 million ($16 million after tax), as well as a pre-tax gain at Georgia Power of approximately $114 million ($84 million after tax) related to the sale of transmission line assets under the integrated transmission system agreement. See Note (B) under "Georgia Power" for additional information.
(c)For Southern Company Gas, includes a pre-tax charge of approximately $38 million ($28 million after tax) associated with the disallowance of certain capital expenditures at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.
(d)For Southern Power, includes a $16 million pre-tax gain ($12 million after tax) on the sale of spare parts.
Products and Services
 Electric Utilities' Revenues
RetailWholesaleOtherTotal
(in millions)
Three Months Ended June 30, 2024$4,486 $627 $343 $5,456 
Three Months Ended June 30, 20233,859 605 300 4,764 
Six Months Ended June 30, 2024$8,427 $1,198 $646 $10,271 
Six Months Ended June 30, 20237,458 1,203 586 9,247 
 Southern Company Gas' Revenues
Gas
Distribution
Operations		Gas
Marketing
Services		OtherTotal
(in millions)
Three Months Ended June 30, 2024$747 $70 $14 $831 
Three Months Ended June 30, 2023761 75 16 852 
Six Months Ended June 30, 2024$2,206 $305 $27 $2,538 
Six Months Ended June 30, 20232,372 320 36 2,728 
Southern Company Gas
Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services. The non-reportable segments are combined and presented as all other.
Gas distribution operations is the largest component of Southern Company Gas' business and includes natural gas local distribution utilities that construct, manage, and maintain intrastate natural gas pipelines and gas distribution facilities in four states.
Gas pipeline investments consists of joint ventures in natural gas pipeline investments including a 50% interest in SNG and a 50% joint ownership interest in the Dalton Pipeline. These natural gas pipelines enable the provision of diverse sources of natural gas supplies to the customers of Southern Company Gas. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.
Gas marketing services provides natural gas marketing to end-use customers primarily in Georgia and Illinois through SouthStar.
The "All other" column includes segments and subsidiaries that fall below the quantitative threshold for separate disclosure, including storage and fuels operations. The "All other" column included a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements in Item 8 of the Form 10-K for additional information.
Business segment financial data for the three and six months ended June 30, 2024 and 2023 was as follows:
Gas Distribution OperationsGas
Pipeline Investments		Gas Marketing ServicesTotalAll OtherEliminationsConsolidated
(in millions)
Three Months Ended June 30, 2024
Operating revenues$749 $8 $70 $827 $7 $(3)$831 
Segment net income
80 22 9 111 (3)— 108 
Six Months Ended June 30, 2024
Operating revenues$2,212 $16 $305 $2,533 $13 $(8)$2,538 
Segment net income
382 52 74 508 9 — 517 
Total assets at June 30, 2024
23,025 1,542 1,632 26,199 9,795 (10,939)25,055 
Three Months Ended June 30, 2023
Operating revenues$764 $8 $75 $847 $9 $(4)$852 
Segment net income (loss)(*)
60 19 7 86 (1)— 85 
Six Months Ended June 30, 2023
Operating revenues$2,383 $16 $320 $2,719 $22 $(13)$2,728 
Segment net income(*)
281 50 56 387 6 — 393 
Total assets at December 31, 2023
22,906 1,534 1,615 26,055 9,675 (10,647)25,083 
(*)For gas distribution operations, includes a pre-tax charge of approximately $38 million ($28 million after tax) associated with the disallowance of certain capital expenditures at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.