Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 0	$ 59
Interest Rate Cap | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	0
Interest Rate Cap | Not Designated as Hedging Instrument, Economic Hedge [Member] | Electric Operating Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	1
Interest Rate Cap | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (1)