Revenue - Revenue Disaggregated by Major Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,833	$ 2,522	$ 5,663	$ 7,045
Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	1,807	2,514	5,551	6,984
Gasoline
Disaggregation of Revenue [Line Items]
Revenue from product sales	882	1,186	2,713	3,287
Distillates
Disaggregation of Revenue [Line Items]
Revenue from product sales	736	1,124	2,273	2,956
Ammonia
Disaggregation of Revenue [Line Items]
Revenue from product sales	25	22	84	116
UAN
Disaggregation of Revenue [Line Items]
Revenue from product sales	77	86	241	354
Urea products
Disaggregation of Revenue [Line Items]
Revenue from product sales	8	8	22	23
Freight revenue
Disaggregation of Revenue [Line Items]
Revenue from product sales	15	15	41	45
Other products
Disaggregation of Revenue [Line Items]
Revenue from product sales	64	73	177	203
Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	26	8	111	60
Other revenue
Disaggregation of Revenue [Line Items]
Other revenue			1	1
Petroleum Segment
Disaggregation of Revenue [Line Items]
Total revenue	1,645	2,293	5,155	6,273
Nitrogen Fertilizer Segment
Disaggregation of Revenue [Line Items]
Total revenue	124	131	385	540
Operating Segments \| Petroleum Segment
Disaggregation of Revenue [Line Items]
Total revenue	1,648	2,298	5,165	6,290
Operating Segments \| Petroleum Segment \| Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	1,622	2,290	5,053	6,229
Operating Segments \| Petroleum Segment \| Gasoline
Disaggregation of Revenue [Line Items]
Revenue from product sales	882	1,186	2,713	3,287
Operating Segments \| Petroleum Segment \| Distillates
Disaggregation of Revenue [Line Items]
Revenue from product sales	699	1,057	2,201	2,806
Operating Segments \| Petroleum Segment \| Ammonia
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Petroleum Segment \| UAN
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Petroleum Segment \| Urea products
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Petroleum Segment \| Freight revenue
Disaggregation of Revenue [Line Items]
Revenue from product sales	4	5	14	13
Operating Segments \| Petroleum Segment \| Other products
Disaggregation of Revenue [Line Items]
Revenue from product sales	37	42	125	123
Operating Segments \| Petroleum Segment \| Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	26	8	111	60
Operating Segments \| Petroleum Segment \| Other revenue
Disaggregation of Revenue [Line Items]
Other revenue			1	1
Operating Segments \| Nitrogen Fertilizer Segment
Disaggregation of Revenue [Line Items]
Total revenue	125	131	386	540
Operating Segments \| Nitrogen Fertilizer Segment \| Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	125	131	386	540
Operating Segments \| Nitrogen Fertilizer Segment \| Gasoline
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Nitrogen Fertilizer Segment \| Distillates
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Nitrogen Fertilizer Segment \| Ammonia
Disaggregation of Revenue [Line Items]
Revenue from product sales	25	22	84	116
Operating Segments \| Nitrogen Fertilizer Segment \| UAN
Disaggregation of Revenue [Line Items]
Revenue from product sales	77	86	241	354
Operating Segments \| Nitrogen Fertilizer Segment \| Urea products
Disaggregation of Revenue [Line Items]
Revenue from product sales	8	8	22	23
Operating Segments \| Nitrogen Fertilizer Segment \| Freight revenue
Disaggregation of Revenue [Line Items]
Revenue from product sales	11	10	27	32
Operating Segments \| Nitrogen Fertilizer Segment \| Other products
Disaggregation of Revenue [Line Items]
Revenue from product sales	4	5	12	15
Operating Segments \| Nitrogen Fertilizer Segment \| Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Nitrogen Fertilizer Segment \| Other revenue
Disaggregation of Revenue [Line Items]
Other revenue			0	0
Other / Elimination
Disaggregation of Revenue [Line Items]
Total revenue	60	93	112	215
Other / Elimination \| Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	60	93	112	215
Other / Elimination \| Gasoline
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Other / Elimination \| Distillates
Disaggregation of Revenue [Line Items]
Revenue from product sales	37	67	72	150
Other / Elimination \| Ammonia
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Other / Elimination \| UAN
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Other / Elimination \| Urea products
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Other / Elimination \| Freight revenue
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Other / Elimination \| Other products
Disaggregation of Revenue [Line Items]
Revenue from product sales	23	26	40	65
Other / Elimination \| Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	$ 0	$ 0	0	0
Other / Elimination \| Other revenue
Disaggregation of Revenue [Line Items]
Other revenue			$ 0	$ 0