Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of the beginning of the period	$ 28	$ 52	$ 32	$ 85
Net realized and unrealized (gains)/losses	110	(19)	99	(56)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3		(2)		6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	0
Transfers out of Level 3 to Level 2			7
Balance as of the end of the period	138	35	138	35
Gain (Loss) from Price Risk Management Activity	$ 0	$ 2	$ 3	$ 3