Sales and Other Operating Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenue from External Customer [Line Items]
Total sales and other operating revenues	$ 132,376	$ 143,153	$ 147,399
United States
Revenue from External Customer [Line Items]
Total sales and other operating revenues	104,259	113,599	118,786
United Kingdom
Revenue from External Customer [Line Items]
Total sales and other operating revenues	13,207	12,713	14,642
Germany
Revenue from External Customer [Line Items]
Total sales and other operating revenues	4,993	5,265	5,547
Other countries
Revenue from External Customer [Line Items]
Total sales and other operating revenues	9,917	11,576	8,424
Refined petroleum products and renewable fuels
Revenue from External Customer [Line Items]
Total sales and other operating revenues	97,359	103,685	108,644
Crude oil resales
Revenue from External Customer [Line Items]
Total sales and other operating revenues	15,183	22,008	20,824
NGL and natural gas
Revenue from External Customer [Line Items]
Total sales and other operating revenues	17,066	14,548	14,467
Services and other
Revenue from External Customer [Line Items]
Total sales and other operating revenues	$ 2,768	$ 2,912	$ 3,464