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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	Jun. 30, 2020	Dec. 31, 2019
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash Collateral (Held) / Posted	$ (36)	$ (32)
Derivative liabilities	(1,027)	(1,103)
Cash Collateral Posted	136	190
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	1,230	1,170
Derivative Instruments	(921)	(909)
Cash Collateral (Held) / Posted	(22)	(7)
Net Amount	287	254
Derivative liabilities	(1,027)	(1,103)
Derivative Instruments	921	909
Cash Collateral Posted	38	73
Net Amount	(68)	(121)
Gross Amounts of Recognized Assets / Liabilities	203	67
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	16	66
Net Amount	$ 219	$ 133

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