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Consolidated Entities and Equity Method Investments - Schedule of Earnings (Loss) from Equity Method Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings from equity method investments | $ 31 | $ 29 | $ 77 | $ 78
SOUTHERN Co GAS |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings from equity method investments | 32 | 28 | 76 | 72
SOUTHERN Co GAS | SNG |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings from equity method investments | $ 32 | $ 28 | $ 76 | $ 72

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