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Derivatives and Risk Management Activities - Net Unrealized Gain/(Loss) Recognized in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative assets and liabilities
Net loss in reclassified to earnings	$ 3	$ 2
Net loss expected to be reclassified to earnings in the next twelve months	13
Other long-term assets, net
Derivative assets and liabilities
Interest rate fair value hedge liability at fair value	114		$ 46
AOCI cash flow hedge
Derivative assets and liabilities
Net loss deferred in AOCI	187
Interest Rate Derivatives
Derivative assets and liabilities
Net unrealized gain/(loss) recognized in AOCI	$ 68	$ (79)