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Segment Information (Income from Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	$ 147	$ 93		$ 289	$ 184
Operating Segments | Refining & Marketing
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	6	14		18	19
Operating Segments | Midstream
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	141	92		271	178
Corporate
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	$ 0	$ (13)	[1]	$ 0	$ (13)	[1]
[1] Impairment of equity method investment.

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

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