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Segment Information (Depreciation and Amortization) (Detail) - 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] |  |  |  |  |  |
Depreciation and amortization | $ 819 | $ 871 | [1] | $ 1,624 | $ 1,715 | [1]
Operating Segments | Refining & Marketing |  |  |  |  |  |
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |  |  |
Depreciation and amortization | 475 | 466 |  | 936 | 944 |
Operating Segments | Midstream |  |  |  |  |  |
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |  |  |
Depreciation and amortization | 330 | 331 |  | 661 | 665 |
Corporate |  |  |  |  |  |
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |  |  |
Depreciation and amortization | $ 14 | $ 74 |  | $ 27 | $ 106 |
[1] | The three and six months ended June 30, 2021 includes $43 million of impairments of long lived assets.

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