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Consolidated Statements of Common Stockholders' Equity - GAS - USD ($) $ in Millions | Total | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Southern Company Gas | Southern Company Gas Paid-In Capital | Southern Company Gas Retained Earnings | Southern Company Gas Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2020 |  |  |  | $ 9,767 | $ 9,930 | $ (141) | $ (22)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income | $ 2,309 |  |  | 539 |  | 539 |
Capital contributions from parent company |  |  |  | 94 | 94 |  |
Other comprehensive income (loss) | 158 |  | $ 158 | 46 |  |  | 46
Cash dividends on common stock | (2,777) | $ (2,777) |  | (530) |  | (530) |
Ending balance at Dec. 31, 2021 |  |  |  | 9,916 | 10,024 | (132) | 24
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income | 3,428 |  |  | 572 |  | 572 |
Capital contributions from parent company |  |  |  | 421 | 421 |  |
Other comprehensive income (loss) | 71 |  | 71 | 7 |  |  | 7
Cash dividends on common stock | (2,907) | (2,907) |  | (519) |  | (519) |
Ending balance at Dec. 31, 2022 | 30,408 |  |  | 10,397 | 10,445 | (79) | 31
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income | 3,849 |  |  | 615 |  | 615 |
Capital contributions from parent company |  |  |  | 391 | 391 |  |
Other comprehensive income (loss) | (10) |  | $ (10) | (15) |  |  | (15)
Cash dividends on common stock | (3,035) | $ (3,035) |  | (585) |  | (585) |
Ending balance at Dec. 31, 2023 | $ 31,444 |  |  | $ 10,803 | $ 10,836 | $ (49) | $ 16

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