Property, Plant and Equipment (PP&E) (Summary of Property, Plant And Equipment) (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Property, Plant, and Equipment [Line Items] | |||||
| Gross PP&E | $ 72,907 | $ 72,907 | $ 71,009 | ||
| Accumulated Depreciation | 34,965 | 34,965 | 33,612 | ||
| Net PP&E | 37,942 | 37,942 | 37,397 | ||
| Depreciation | 762 | $ 723 | 1,490 | $ 1,450 | |
| Depreciation | 762 | $ 723 | 1,490 | $ 1,450 | |
| Operating Segments | Refining & Marketing | |||||
| Property, Plant, and Equipment [Line Items] | |||||
| Gross PP&E | 34,918 | 34,918 | 34,372 | ||
| Accumulated Depreciation | 21,148 | 21,148 | 20,462 | ||
| Net PP&E | 13,770 | 13,770 | 13,910 | ||
| Operating Segments | Midstream | |||||
| Property, Plant, and Equipment [Line Items] | |||||
| Gross PP&E | 35,450 | 35,450 | 34,057 | ||
| Accumulated Depreciation | 12,345 | 12,345 | 11,690 | ||
| Net PP&E | 23,105 | 23,105 | 22,367 | ||
| Operating Segments | Renewable Diesel | |||||
| Property, Plant, and Equipment [Line Items] | |||||
| Gross PP&E | 970 | 970 | 970 | ||
| Accumulated Depreciation | 426 | 426 | 396 | ||
| Net PP&E | 544 | 544 | 574 | ||
| Corporate | |||||
| Property, Plant, and Equipment [Line Items] | |||||
| Gross PP&E | 1,569 | 1,569 | 1,610 | ||
| Accumulated Depreciation | 1,046 | 1,046 | 1,064 | ||
| Net PP&E | $ 523 | $ 523 | $ 546 | ||