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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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