Sales and Other Operating Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	$ 51,004	$ 33,323	$ 83,544	$ 63,753
United States
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	41,216	26,022	67,006	50,181
United Kingdom
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	5,842	3,389	9,616	6,351
Germany
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	806	1,309	1,515	2,527
Other countries
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	3,140	2,603	5,407	4,694
Refined petroleum products and renewable fuels
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	36,976	24,211	61,854	46,460
Crude oil resales
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	8,262	4,151	12,586	7,253
Natural gas liquids and natural gas
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	4,650	4,076	9,191	8,582
Services and other
Disaggregation of Revenue [Line Items]
Consolidated sales and other operating revenues	$ 1,116	$ 885	$ (87)	$ 1,458