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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, 2019	Dec. 31, 2018
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash Collateral (Held) / Posted	$ (11)	$ (33)
Derivative liabilities	(839)	(977)
Cash Collateral Posted	388	287
Gross Amounts of Recognized Assets / Liabilities	119	104
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	87	83
Net Amount	206	187
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	929	1,042
Derivative Instruments	(689)	(778)
Cash Collateral (Held) / Posted	(5)	(31)
Net Amount	235	233
Derivative liabilities	(839)	(977)
Derivative Instruments	689	778
Cash Collateral Posted	92	114
Net Amount	(58)	(85)
Gross Amounts of Recognized Assets / Liabilities	90	65
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	87	83
Net Amount	177	148
Interest rate contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	29	39
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	0	0
Net Amount	29	39
Gross Amounts of Recognized Assets / Liabilities	29	39
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	0	0
Net Amount	$ 29	$ 39

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