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Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Derivative [Line Items] |  |  |  |
Total |  |  | $ 1,161 | $ (146)
Not Designated as Hedging Instrument, Economic Hedge | Commodity Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Total | $ 400 | $ 137 | 1,178 | (131)
Not Designated as Hedging Instrument, Economic Hedge | Commodity Contract | Operating revenues |  |  |  |
Derivative [Line Items] |  |  |  |
Total | 519 | 173 | 774 | 1,317
Not Designated as Hedging Instrument, Economic Hedge | Commodity Contract | Purchased power and fuel |  |  |  |
Derivative [Line Items] |  |  |  |
Total | $ (119) | $ (36) | $ 404 | $ (1,448)

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