Property, Plant And Equipment And Asset Retirement Obligations (Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, cost	$ 570,059	$ 553,903
Property, plant and equipment, net	299,373	294,318	$ 214,940
Upstream
Property, Plant and Equipment [Line Items]
Property, plant and equipment, cost	436,018	423,038
Property, plant and equipment, net	228,235	226,021
Energy Products
Property, Plant and Equipment [Line Items]
Property, plant and equipment, cost	60,261	58,259
Property, plant and equipment, net	29,547	28,349
Chemical Products
Property, Plant and Equipment [Line Items]
Property, plant and equipment, cost	39,594	39,224
Property, plant and equipment, net	20,053	19,973
Specialty Products
Property, Plant and Equipment [Line Items]
Property, plant and equipment, cost	8,820	9,559
Property, plant and equipment, net	4,333	4,229
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, cost	25,366	23,823
Property, plant and equipment, net	$ 17,205	$ 15,746