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Property, Plant and Equipment (PP&E) (Summary of Property, Plant And Equipment) (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Gross PP&E	$ 67,494	$ 66,317
Accumulated Depreciation	32,689	31,289
Net PP&E	34,805	35,028
Operating Segments | Refining & Marketing
Property, Plant and Equipment [Line Items]
Gross PP&E	33,546	32,965
Accumulated Depreciation	19,752	19,015
Net PP&E	13,794	13,950
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Gross PP&E	31,291	30,697
Accumulated Depreciation	11,408	10,798
Net PP&E	19,883	19,899
Operating Segments | Renewable Diesel
Property, Plant and Equipment [Line Items]
Gross PP&E	969	976
Accumulated Depreciation	364	338
Net PP&E	605	638
Corporate
Property, Plant and Equipment [Line Items]
Gross PP&E	1,688	1,679
Accumulated Depreciation	1,165	1,138
Net PP&E	$ 523	$ 541

X

- Definition

Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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