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Segment Information (Segment Adjusted EBITDA to Income (Loss) from Operations before Income Taxes) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Refining planned turnaround costs $ (290) $ (153) $ (1,121) $ (902)
Garyville incident response costs 0 (63) 0 (63)
Gain (loss) on disposition of stock in subsidiary or equity method investee [1] 0 106 151 106
Depreciation and amortization (846) (845) (2,511) (2,479)
Net interest and other financial costs (221) (118) (594) (414)
Income before income taxes 1,128 4,635 5,061 11,705
Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 2,681 5,912 9,736 15,990
Depreciation and amortization (818) (803) (2,436) (2,399)
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 1,053 4,373 4,899 11,389
Depreciation and amortization (465) (463) (1,395) (1,411)
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 1,628 1,539 4,837 4,601
Depreciation and amortization (353) (340) (1,041) (988)
Corporate        
Segment Reporting Information [Line Items]        
Costs and expenses, excluding depreciation (196) (204) (600) (533)
Depreciation and amortization $ (28) $ (42) $ (75) $ (80)
[1] The first nine months of 2024 includes the gain from the Whistler Joint Venture Transaction (as defined in Note 13). 2023 includes the gain on the sale of our interest in South Texas Gateway Terminal LLC. See Note 13 for additional information.