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Derivatives and Risk Management Activities - Net Unrealized Gain/(Loss) Recognized in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other long-term assets, net
Derivatives, Fair Value [Line Items]
Interest rate fair value hedge liability at fair value	$ 65	$ 46
Interest rate derivatives
Derivatives, Fair Value [Line Items]
Net deferred gain/(loss) recognized in AOCI on derivatives	19	$ (10)	$ (91)
AOCI cash flow hedge
Derivatives, Fair Value [Line Items]
Net loss deferred in AOCI	$ 208