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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	Sep. 30, 2020	Dec. 31, 2019
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash Collateral (Held) / Posted	$ (15)	$ (32)
Derivative liabilities	(813)	(1,103)
Cash Collateral Posted	77	190
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	893	1,170
Derivative Instruments	(738)	(909)
Cash Collateral (Held) / Posted	(1)	(7)
Net Amount	154	254
Derivative liabilities	(813)	(1,103)
Derivative Instruments	738	909
Cash Collateral Posted	0	73
Net Amount	(75)	(121)
Gross Amounts of Recognized Assets / Liabilities	80	67
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(1)	66
Net Amount	$ 79	$ 133

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