Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Liabilities
Derivate asset, subject to master netting arrangement, collateral, obligation to return security not offset	$ 8	$ 3
Commodity derivative instruments
Assets
Derivative assets	18	17
Contract netting	(15)	(13)
Collateral netting	0	0
Net value	3	4
Liabilities
Derivative liabilities	21	13
Contract netting	(15)	(13)
Collateral netting	0	0
Net value	6	0
Commodity derivative instruments \| Level 1
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Commodity derivative instruments \| Level 2
Assets
Derivative assets	18	17
Liabilities
Derivative liabilities	21	13
Commodity derivative instruments \| Level 3
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
RFS
Liabilities
Derivative liabilities	93	323
Contract netting	0	0
Collateral netting	0	0
Net value	93	323
RFS \| Level 1
Liabilities
Derivative liabilities	0	0
RFS \| Level 2
Liabilities
Derivative liabilities	93	323
RFS \| Level 3
Liabilities
Derivative liabilities	$ 0	$ 0

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