Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives		$ (4)	$ 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	$ (4)	(4)
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	(6)	(5)
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	$ 2	$ 1