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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Net loss in reclassified to earnings	$ 11	$ 9	$ 5
Net loss in reclassification to earnings	13
Other long-term assets, net
Derivatives, Fair Value [Line Items]
Interest rate fair value hedge liability at fair value	46
Other current liabilities
Derivatives, Fair Value [Line Items]
Interest rate fair value hedge liability at fair value		44
AOCI cash flow hedge
Derivatives, Fair Value [Line Items]
Net loss deferred in AOCI	258
Interest Rate Derivatives
Derivatives, Fair Value [Line Items]
Net unrealized gain/(loss) recognized in AOCI	$ (10)	$ (91)	$ 38