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Derivatives and Risk Management Activities - Net Unrealized Gain/(Loss) Recognized in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Other current assets
Derivative assets and liabilities
Net fair value of interest rate hedges	$ 57		$ 57
Other long-term assets, net
Derivative assets and liabilities
Net fair value of interest rate hedges	79		79		$ 65
AOCI cash flow hedge
Derivative assets and liabilities
Net loss deferred in AOCI	134		134
Interest rate derivatives
Derivative assets and liabilities
Net unrealized gain/(loss) recognized in AOCI	$ 36	$ (39)	$ 68	$ 29