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Risk Management - FV Input Level - Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross amount	$ 931	$ 460
Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	99	56
Contracts available for netting	(35)	(19)
Cash collateral held(b)	0	(21)
Net amount	64	16
Interest rate contracts
Derivative [Line Items]
Gross amount	694	358
Contracts available for netting	(2)	0
Cash collateral held(b)	0	0
Net amount	692	358
Foreign currency contracts
Derivative [Line Items]
Gross amount	138	46
Contracts available for netting	(6)	(6)
Cash collateral held(b)	0	0
Net amount	132	40
Level 1 | Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	6	19
Level 1 | Interest rate contracts
Derivative [Line Items]
Gross amount	0	0
Level 1 | Foreign currency contracts
Derivative [Line Items]
Gross amount	0	0
Level 2 | Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	93	37
Level 2 | Interest rate contracts
Derivative [Line Items]
Gross amount	694	358
Level 2 | Foreign currency contracts
Derivative [Line Items]
Gross amount	138	46
Level 3 | Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	0	0
Level 3 | Interest rate contracts
Derivative [Line Items]
Gross amount	0	0
Level 3 | Foreign currency contracts
Derivative [Line Items]
Gross amount	$ 0	$ 0

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