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Risk Management - FV Input Level - Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Gross amount	$ (389)	$ (395)
Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	(106)	(113)
Contracts available for netting	19	16
Cash collateral posted		(85)
Cash collateral posted(a)	52
Net amount	(35)	(182)
Interest rate contracts
Derivative [Line Items]
Gross amount	(254)	(278)
Contracts available for netting	0	0
Cash collateral posted		0
Cash collateral posted(a)	0
Net amount	(254)	(278)
Foreign currency contracts
Derivative [Line Items]
Gross amount	(29)	(4)
Contracts available for netting	0	0
Cash collateral posted		0
Cash collateral posted(a)	0
Net amount	(29)	(4)
Level 1 | Energy commodity derivative contracts
Derivative [Line Items]
Gross amount	(17)	(17)
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	(89)	(96)
Level 2 | Interest rate contracts
Derivative [Line Items]
Gross amount	(254)	(278)
Level 2 | Foreign currency contracts
Derivative [Line Items]
Gross amount	(29)	(4)
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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