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Property, Plant and Equipment (PP&E) (Summary of Property, Plant And Equipment) (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Gross PP&E	$ 65,150	$ 63,748
Accumulated Depreciation	30,608	28,636
Net PP&E	34,542	35,112
Operating Segments | Refining & Marketing
Property, Plant and Equipment [Line Items]
Gross PP&E	33,103	32,496
Accumulated Depreciation	18,990	17,992
Net PP&E	14,113	14,504
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Gross PP&E	30,390	29,620
Accumulated Depreciation	10,495	9,589
Net PP&E	19,895	20,031
Corporate
Property, Plant and Equipment [Line Items]
Gross PP&E	1,657	1,632
Accumulated Depreciation	1,123	1,055
Net PP&E	$ 534	$ 577

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
-Topic 360
-SubTopic 10
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Reference 2: 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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-SubTopic 10
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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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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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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