Revenues - Schedule of Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Sales and other revenues:	$ 7,251	$ 7,207	$ 20,405	$ 22,080
Total refined product revenues
Disaggregation of Revenue [Line Items]
Sales and other revenues:	6,664	6,735	18,861	20,702
Total refined product revenues | Mid-Continent
Disaggregation of Revenue [Line Items]
Sales and other revenues:	2,440	2,451	6,786	7,536
Total refined product revenues | Rocky Mountains
Disaggregation of Revenue [Line Items]
Sales and other revenues:	1,468	1,600	4,065	4,558
Total refined product revenues | Northwest
Disaggregation of Revenue [Line Items]
Sales and other revenues:	1,312	1,126	3,753	3,676
Total refined product revenues | Southwest
Disaggregation of Revenue [Line Items]
Sales and other revenues:	913	1,019	2,686	3,277
Total refined product revenues | Northeast
Disaggregation of Revenue [Line Items]
Sales and other revenues:	204	209	636	641
Total refined product revenues | Canada
Disaggregation of Revenue [Line Items]
Sales and other revenues:	260	267	728	811
Total refined product revenues | Europe, Asia and Latin America
Disaggregation of Revenue [Line Items]
Sales and other revenues:	67	63	207	203
Transportation fuels
Disaggregation of Revenue [Line Items]
Sales and other revenues:	5,667	5,585	15,972	17,242
Lubricants and specialty products
Disaggregation of Revenue [Line Items]
Sales and other revenues:	596	610	1,776	1,868
Asphalt, fuel oil and other products
Disaggregation of Revenue [Line Items]
Sales and other revenues:	401	540	1,113	1,592
Excess crude oil revenues
Disaggregation of Revenue [Line Items]
Sales and other revenues:	394	360	1,122	1,064
Transportation and logistics services
Disaggregation of Revenue [Line Items]
Sales and other revenues:	29	28	87	78
Other revenues
Disaggregation of Revenue [Line Items]
Sales and other revenues:	$ 164	$ 84	$ 335	$ 236