Property, Plant and Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Gross PP&E	[1]	$ 66,317	$ 63,748
Accumulated depreciation	[1]	31,289	28,636
Property, plant and equipment, net	[1]	35,028	35,112
Operating Segments | Refining & Marketing
Property, Plant and Equipment [Line Items]
Gross PP&E		32,965	31,536
Accumulated depreciation		19,015	17,721
Property, plant and equipment, net		13,950	13,815
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Gross PP&E		30,697	29,620
Accumulated depreciation		10,798	9,589
Property, plant and equipment, net		19,899	20,031
Operating Segments | Renewable Diesel
Property, Plant and Equipment [Line Items]
Gross PP&E		976	960
Accumulated depreciation		338	271
Property, plant and equipment, net		638	689
Corporate
Property, Plant and Equipment [Line Items]
Gross PP&E		1,679	1,632
Accumulated depreciation		1,138	1,055
Property, plant and equipment, net		$ 541	$ 577

[1] Includes finance leases. See Note 26.