Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of the beginning of the period	$ 39	$ 43	$ 34	$ 45
Net realized and unrealized (gains)/losses	(5)	2	4	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	(3)
Transfers out of Level 3 to Level 2			(7)
Balance as of the end of the period	31	45	31	45
Gain (Loss) from Price Risk Management Activity	$ 3	$ 2	$ 4	$ 1