Revenue - Schedule of Revenue Disaggregated by Major Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,281	$ 1,944	$ 8,000	$ 5,352
Product Sales, Excluding Renewable Fuel Activity
Disaggregation of Revenue [Line Items]
Total revenue	3,281	1,900	8,000	5,243
Other
Disaggregation of Revenue [Line Items]
Total revenue	0	44	0	109
Petroleum Segment
Disaggregation of Revenue [Line Items]
Other revenue	117	57	228	141
Petroleum Segment \| Product Sales, Excluding Renewable Fuel Activity
Disaggregation of Revenue [Line Items]
Total revenue	3,135	1,736	7,472	4,769
Petroleum Segment \| Gasoline
Disaggregation of Revenue [Line Items]
Revenue	1,397	856	3,437	2,283
Petroleum Segment \| Distillates
Disaggregation of Revenue [Line Items]
Revenue	1,597	794	3,760	1,984
Petroleum Segment \| Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue	24	29	47	361
Nitrogen Fertilizer Segment
Disaggregation of Revenue [Line Items]
Other revenue	15	15	44	42
Nitrogen Fertilizer Segment \| Product Sales, Excluding Renewable Fuel Activity
Disaggregation of Revenue [Line Items]
Total revenue	146	164	528	474
Nitrogen Fertilizer Segment \| Ammonia
Disaggregation of Revenue [Line Items]
Revenue	23	25	116	93
Nitrogen Fertilizer Segment \| UAN
Disaggregation of Revenue [Line Items]
Revenue	101	114	338	310
Nitrogen Fertilizer Segment \| Urea products
Disaggregation of Revenue [Line Items]
Revenue	$ 7	$ 10	$ 30	$ 29