Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 53	$ 568	$ 268
Interest Rate Cap | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	5
Interest Rate Cap | Electric Operating Revenues [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	2
Interest Rate Cap | Interest Expense | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 3