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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	Mar. 31, 2020	Dec. 31, 2019
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash Collateral (Held) / Posted	$ (51)	$ (32)
Derivative liabilities	(1,202)	(1,103)
Cash Collateral Posted	200	190
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	1,318	1,170
Derivative Instruments	(1,010)	(909)
Cash Collateral (Held) / Posted	(17)	(7)
Net Amount	291	254
Derivative liabilities	(1,202)	(1,103)
Derivative Instruments	1,010	909
Cash Collateral Posted	94	73
Net Amount	(98)	(121)
Gross Amounts of Recognized Assets / Liabilities	116	67
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	77	66
Net Amount	$ 193	$ 133

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