Consolidated Statements of Comprehensive Income - GAS (Parenthetical) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Qualifying hedges, change in fair value, tax | $ (2) | $ (17) | $ (19) |
| Qualifying hedges, reclassification adjustment, tax | 28 | 27 | 23 |
| Pension and other postretirement benefit plans, gain (loss), tax | 10 | (14) | 18 |
| Reclassification adjustment for amounts included in net income, tax | 0 | 0 | 3 |
| Southern Company Gas | |||
| Qualifying hedges, change in fair value, tax | (3) | (18) | 5 |
| Qualifying hedges, reclassification adjustment, tax | 12 | 19 | (9) |
| Pension and other postretirement benefit plans, gain (loss), tax | 5 | (7) | 8 |
| Reclassification adjustment for amounts included in net income, tax | $ (1) | $ 0 | $ 0 |