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Segment Information (Income from Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Income from equity method investments	$ 219	$ 215	$ 796		$ 547
Operating Segments
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Income from equity method investments	219	215	645		547
Operating Segments | Refining & Marketing
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Income from equity method investments	43	24	85		5
Operating Segments | Midstream
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Income from equity method investments	176	191	560		542
Corporate
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Income from equity method investments	$ 0	$ 0	$ 151	[1]	$ 0
[1] 2024 represents the gain from the Whistler Joint Venture Transaction. See Note 13 for additional information.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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