Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue by Segment
Revenues	[1]	$ 32,876	$ 38,404	$ 99,125	$ 109,352
Refining [Member]
Revenue by Segment
Revenues		31,332	36,521	94,519	102,924
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		14,361	17,025	43,004	47,302
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		13,855	16,392	42,286	47,222
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		3,116	3,104	9,229	8,400
Renewable Diesel [Member]
Revenue by Segment
Revenues		632	759	1,888	2,990
Renewable Diesel [Member] | Renewable Diesel [Member]
Revenue by Segment
Revenues		610	739	1,829	2,864
Renewable Diesel [Member] | Renewable Naphtha [Member]
Revenue by Segment
Revenues		22	20	59	126
Ethanol [Member]
Revenue by Segment
Revenues		912	1,124	2,718	3,438
Ethanol [Member] | Ethanol [Member]
Revenue by Segment
Revenues		685	861	1,985	2,522
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		$ 227	$ 263	$ 733	$ 916

[1] Includes excise taxes on sales by certain of our foreign operations of $1,539 million and $1,468 million for the three months ended September 30, 2024 and 2023, respectively, and $4,382 million and $4,339 million for the nine months ended September 30, 2024 and 2023, respectively.