Property, Plant and Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross PP&E	[1]	$ 61,501	$ 60,633
Accumulated depreciation	[1]	25,844	23,193
Property, plant and equipment, net	[1]	35,657	37,440
Operating Segments | Refining & Marketing
Property, Plant and Equipment [Line Items]
Gross PP&E		32,292	31,089
Accumulated depreciation		16,745	14,876
Property, plant and equipment, net		15,547	16,213
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Gross PP&E		27,659	28,098
Accumulated depreciation		8,118	7,384
Property, plant and equipment, net		19,541	20,714
Corporate
Property, Plant and Equipment [Line Items]
Gross PP&E		1,550	1,446
Accumulated depreciation		981	933
Property, plant and equipment, net		$ 569	$ 513

[1] Includes finance leases. See Note 28.