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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, 2021	Dec. 31, 2020
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Cash collateral received in support of energy risk management activities	$ (55)	$ (19)
Derivative liabilities	(2,440)	(884)
Cash Collateral Posted	298	50
Gross Amounts of Recognized Assets / Liabilities	384
Derivative Instruments	0
Cash Collateral (Held) / Posted	(10)
Net Amount	374
Foreign exchange contract
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative liabilities	(2)
Derivative Instruments	0
Cash Collateral Posted	0
Net Amount	(2)
Gross Amounts of Recognized Assets / Liabilities	(2)
Derivative Instruments	0
Cash Collateral (Held) / Posted	0
Net Amount	(2)
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative assets	2,824	821
Derivative Instruments	(2,253)	(658)
Cash collateral received in support of energy risk management activities	(10)	(5)
Net Amount	561	158
Derivative liabilities	(2,438)	(884)
Derivative Instruments	2,253	658
Cash Collateral Posted	0	0
Net Amount	(185)	(226)
Gross Amounts of Recognized Assets / Liabilities	386	(63)
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(10)	(5)
Net Amount	$ 376	$ (68)

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