Revenue - Schedule of Revenue Disaggregated by Major Product (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,738	$ 1,761	$ 4,718	$ 3,407
Product Sales, Excluding Renewable Fuel Activity
Disaggregation of Revenue [Line Items]
Total revenue	2,738	1,726	4,718	3,343
Sales, Renewable Fuel Activity
Disaggregation of Revenue [Line Items]
Total revenue	0	35	0	64
Petroleum Segment
Disaggregation of Revenue [Line Items]
Other revenue	59	49	110	84
Petroleum Segment \| Product Sales, Excluding Renewable Fuel Activity
Disaggregation of Revenue [Line Items]
Total revenue	2,536	1,558	4,336	3,033
Petroleum Segment \| Gasoline
Disaggregation of Revenue [Line Items]
Revenue	1,187	774	2,040	1,427
Petroleum Segment \| Distillates
Disaggregation of Revenue [Line Items]
Revenue	1,277	649	2,163	1,190
Petroleum Segment \| Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue	13	86	23	332
Nitrogen Fertilizer Segment
Disaggregation of Revenue [Line Items]
Other revenue	15	14	29	28
Nitrogen Fertilizer Segment \| Product Sales, Excluding Renewable Fuel Activity
Disaggregation of Revenue [Line Items]
Total revenue	202	168	382	310
Nitrogen Fertilizer Segment \| Ammonia
Disaggregation of Revenue [Line Items]
Revenue	43	34	93	67
Nitrogen Fertilizer Segment \| UAN
Disaggregation of Revenue [Line Items]
Revenue	131	110	237	196
Nitrogen Fertilizer Segment \| Urea products
Disaggregation of Revenue [Line Items]
Revenue	$ 13	$ 10	$ 23	$ 19