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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Other long-term assets, net
Derivative assets and liabilities
Interest rate fair value hedge liability at fair value	$ 75		$ 75		$ 46
AOCI cash flow hedge
Derivative assets and liabilities
Net loss deferred in AOCI	223		223
Interest Rate Derivatives
Derivative assets and liabilities
Net unrealized gain/(loss) recognized in AOCI	$ (39)	$ 19	$ 29	$ (61)