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Risk Management - FV Input Level - Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Gross amount	$ 62	$ 178
Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	35	140
Contracts available for netting	(19)	(16)
Cash collateral held(a)	0	0
Net amount	16	124
Interest rate contracts
Derivative [Line Items]
Gross amount	27	38
Contracts available for netting	0	0
Cash collateral held(a)	0	0
Net amount	27	38
Level 1 | Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	6	65
Level 1 | Interest rate contracts
Derivative [Line Items]
Gross amount	0	0
Level 2 | Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	29	75
Level 2 | Interest rate contracts
Derivative [Line Items]
Gross amount	27	38
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

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