Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue by Segment
Revenues	[1]	$ 32,168	$ 32,876	$ 92,315	$ 99,125
Refining [Member]
Revenue by Segment
Revenues		30,414	31,332	87,495	94,519
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		13,287	14,361	38,382	43,004
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		14,582	13,855	40,736	42,286
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		2,545	3,116	8,377	9,229
Renewable Diesel [Member]
Revenue by Segment
Revenues		719	632	1,777	1,888
Renewable Diesel [Member] | Renewable Diesel [Member]
Revenue by Segment
Revenues		623	610	1,484	1,829
Renewable Diesel [Member] | Renewable Naphtha [Member]
Revenue by Segment
Revenues		29	22	114	59
Renewable Diesel [Member] | Neat SAF [Member]
Revenue by Segment
Revenues		67	0	179	0
Ethanol [Member]
Revenue by Segment
Revenues		1,035	912	3,043	2,718
Ethanol [Member] | Ethanol [Member]
Revenue by Segment
Revenues		823	685	2,390	1,985
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		$ 212	$ 227	$ 653	$ 733

[1] Includes excise taxes on sales by certain of our foreign operations of $1,827 million and $1,539 million for the three months ended September 30, 2025 and 2024, respectively, and $4,993 million and $4,382 million for the nine months ended September 30, 2025 and 2024, respectively.