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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, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative assets and liabilities
Gain/(loss) reclassified to earnings	$ 2	$ 2
Net loss expected to be reclassified to earnings in the next twelve months	12
Other current liabilities
Derivative assets and liabilities
Interest rate fair value hedge liability at fair value	115		$ 44
Other long-term liabilities and deferred credits
Derivative assets and liabilities
Interest rate fair value hedge liability at fair value	9
AOCI cash flow hedge
Derivative assets and liabilities
Net loss deferred in AOCI	336
Interest Rate Derivatives
Derivative assets and liabilities
Net unrealized gain/(loss) recognized in AOCI	$ (79)	$ (23)