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Segment and Related Information (Tables)
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Schedule of Financial Data for Business Segments
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 
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.
Schedule of Financial Data for 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