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Risk Management - FV Input Level - Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross amount	$ (78)	$ (65)
Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	(63)	(58)
Contracts available for netting	35	19
Collateral posted(b)	(8)	0
Net amount	(36)	(39)
Interest rate contracts
Derivative [Line Items]
Gross amount	(10)	(1)
Contracts available for netting	2	0
Collateral posted(b)	0	0
Net amount	(8)	(1)
Foreign currency contracts
Derivative [Line Items]
Gross amount	(6)	(6)
Contracts available for netting	6	6
Collateral posted(b)	0	0
Net amount	0	0
Level 1 | Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	(7)	(3)
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	(56)	(55)
Level 2 | Interest rate contracts
Derivative [Line Items]
Gross amount	(10)	(1)
Level 2 | Foreign currency contracts
Derivative [Line Items]
Gross amount	(6)	(6)
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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