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Accounting for Derivative Instruments and Hedging Activities - Offsetting of Derivatives by Counterparty Master Agreement level and Collateral Received (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash Collateral (Held)/Posted	$ (19)	$ (32)
Cash Collateral (Held)/Posted	50	190
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	821	1,170
Derivative Instruments	(658)	(909)
Cash Collateral (Held)/Posted	(5)	(7)
Net Amount	158	254
Derivative liabilities	(884)	(1,103)
Derivative Instruments	658	909
Cash Collateral (Held)/Posted	0	73
Net Amount	(226)	(121)
Gross Amounts of Recognized Assets / Liabilities	(63)	67
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(5)	66
Net Amount	$ (68)	$ 133

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