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Segment and Related Information
 9 Months Ended
Sep. 30, 2023
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 $156 million and $406 million for the three and nine months ended September 30, 2023, respectively, and $336 million and $673 million for the three and nine months ended September 30, 2022, 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 nine months ended September 30, 2023 and 2022 was as follows:
Electric Utilities
Traditional
Electric Operating
Companies		Southern
Power		EliminationsTotalSouthern Company GasAll
Other		EliminationsConsolidated
(in millions)
Three Months Ended September 30, 2023
Operating revenues$5,674 $653 $(160)$6,167 $689 $154 $(30)$6,980 
Segment net income (loss)(a)(b)(c)
1,419 100 — 1,519 82 (179)— 1,422 
Nine Months Ended September 30, 2023
Operating revenues$14,145 $1,686 $(417)$15,414 $3,417 $499 $(122)$19,208 
Segment net income (loss)(a)(b)(c)(d)
2,852 288 — 3,140 475 (490)(4)3,121 
At September 30, 2023
Goodwill$— $2 $— $2 $5,015 $144 $— $5,161 
Total assets99,464 13,090 (568)111,986 24,823 2,370 (858)138,321 
Three Months Ended September 30, 2022
Operating revenues$6,938 $1,180 $(691)$7,427 $857 $135 $(41)$8,378 
Segment net income (loss)(a)(b)
1,445 95 — 1,540 83 (152)1 1,472 
Nine Months Ended September 30, 2022
Operating revenues$16,716 $2,618 $(1,391)$17,943 $3,998 $418 $(127)$22,232 
Segment net income (loss)(a)(b)
3,256 265 — 3,521 516 (415)(11)3,611 
At December 31, 2022
Goodwill$— $2 $— $2 $5,015 $144 $— $5,161 
Total assets95,861 13,081 (659)108,283 24,621 2,665 (678)134,891 
(a)Attributable to Southern Company.
(b)For the traditional electric operating companies, includes pre-tax charges (credits) to income at Georgia Power for the estimated probable loss associated with the construction of Plant Vogtle Units 3 and 4 of $160 million ($120 million after tax) for the three and nine months ended September 30, 2023 and $(70) million ($(52) million after tax) and $(18) million ($(13) million after tax) for the three and nine months ended September 30, 2022, respectively. See Note (B) and Note 2 to the financial statements in Item 8 of the Form 10-K under "Georgia Power – Nuclear Construction" for additional information.
(c)For Southern Power, includes an $18 million pre-tax loss recovery ($9 million after tax and partnership allocations) for the three and nine months ended September 30, 2023 related to an arbitration interim award and a $16 million pre-tax gain ($12 million after tax) on the sale of spare parts for the nine months ended September 30, 2023. See Note (C) under "General Litigation Matters – Southern Power" for additional information.
(d)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 (B) under "Southern Company Gas" for additional information.
Products and Services
 Electric Utilities' Revenues
RetailWholesaleOtherTotal
(in millions)
Three Months Ended September 30, 2023$5,139 $727 $301 $6,167 
Three Months Ended September 30, 20225,961 1,197 269 7,427 
Nine Months Ended September 30, 2023$12,597 $1,930 $887 $15,414 
Nine Months Ended September 30, 202214,363 2,798 782 17,943 
 Southern Company Gas' Revenues
Gas
Distribution
Operations		Gas
Marketing
Services		OtherTotal
(in millions)
Three Months Ended September 30, 2023$617 $56 $16 $689 
Three Months Ended September 30, 2022748 85 24 857 
Nine Months Ended September 30, 2023$2,989 $376 $52 $3,417 
Nine Months Ended September 30, 20223,513 420 65 3,998 
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 Texas through its sale in November 2022 and 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 and Note (K) under "Southern Company Gas" for additional information.
Business segment financial data for the three months ended September 30, 2023 and 2022 was as follows:
Gas Distribution OperationsGas
Pipeline Investments		Gas Marketing ServicesTotalAll OtherEliminationsConsolidated
(in millions)
Three Months Ended September 30, 2023
Operating revenues$619 $8 $56 $683 $8 $(2)$689 
Segment net income (loss)
70 24 2 96 (14)— 82 
Nine Months Ended September 30, 2023
Operating revenues$3,002 $24 $376 $3,402 $30 $(15)$3,417 
Segment net income(*)
352 73 59 484 (9)— 475 
Total assets at September 30, 2023
22,625 1,542 1,519 25,686 9,795 (10,658)24,823 
Three Months Ended September 30, 2022
Operating revenues$751 $8 $85 $844 $16 $(3)$857 
Segment net income (loss)59 24 (2)81 2 — 83 
Nine Months Ended September 30, 2022
Operating revenues$3,533 $24 $420 $3,977 $43 $(22)$3,998 
Segment net income365 76 65 506 10 — 516 
Total assets at December 31, 2022
22,040 1,577 1,616 25,233 8,943 (9,555)24,621 
(*)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 (B) under "Southern Company Gas" for additional information.