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Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Net fair value changes related to derivatives	$ (22)	$ 53	$ 568
Interest Rate Cap \| Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Net fair value changes related to derivatives	(20)	(5)
Interest Rate Cap \| Electric Operating Revenues [Member] \| Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Net fair value changes related to derivatives	(20)	(2)
Interest Rate Cap \| Interest Expense \| Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Net fair value changes related to derivatives	$ 0	$ (3)

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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