Revenue - Revenue Disaggregated by Major Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,883	$ 1,005	$ 5,129	$ 2,811
Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	1,876	997	5,084	2,755
Gasoline
Disaggregation of Revenue [Line Items]
Revenue from product sales	962	513	2,619	1,329
Distillates
Disaggregation of Revenue [Line Items]
Revenue from product sales	723	381	1,996	1,102
Ammonia
Disaggregation of Revenue [Line Items]
Revenue from product sales	27	13	68	64
UAN
Disaggregation of Revenue [Line Items]
Revenue from product sales	99	51	224	153
Other urea products
Disaggregation of Revenue [Line Items]
Revenue from product sales	8	3	20	11
Freight revenue
Disaggregation of Revenue [Line Items]
Revenue from product sales	14	14	40	37
Other
Disaggregation of Revenue [Line Items]
Revenue from product sales	43	22	117	59
Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	6	8	43	55
Other revenue
Disaggregation of Revenue [Line Items]
Other revenue	1	0	2	1
Operating Segments \| Petroleum
Disaggregation of Revenue [Line Items]
Net sales	1,742	927	4,793	2,556
Operating Segments \| Petroleum \| Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	1,735	919	4,748	2,500
Operating Segments \| Petroleum \| Gasoline
Disaggregation of Revenue [Line Items]
Revenue from product sales	962	513	2,619	1,329
Operating Segments \| Petroleum \| Distillates
Disaggregation of Revenue [Line Items]
Revenue from product sales	723	381	1,996	1,102
Operating Segments \| Petroleum \| Ammonia
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Petroleum \| UAN
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Petroleum \| Other urea products
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Petroleum \| Freight revenue
Disaggregation of Revenue [Line Items]
Revenue from product sales	5	4	16	13
Operating Segments \| Petroleum \| Other
Disaggregation of Revenue [Line Items]
Revenue from product sales	45	21	117	56
Operating Segments \| Petroleum \| Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	6	8	43	55
Operating Segments \| Petroleum \| Other revenue
Disaggregation of Revenue [Line Items]
Other revenue	1	0	2	1
Operating Segments \| Nitrogen Fertilizer
Disaggregation of Revenue [Line Items]
Net sales	145	79	344	260
Operating Segments \| Nitrogen Fertilizer \| Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	145	79	344	260
Operating Segments \| Nitrogen Fertilizer \| Gasoline
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Nitrogen Fertilizer \| Distillates
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Nitrogen Fertilizer \| Ammonia
Disaggregation of Revenue [Line Items]
Revenue from product sales	27	13	68	64
Operating Segments \| Nitrogen Fertilizer \| UAN
Disaggregation of Revenue [Line Items]
Revenue from product sales	99	51	224	153
Operating Segments \| Nitrogen Fertilizer \| Other urea products
Disaggregation of Revenue [Line Items]
Revenue from product sales	8	3	20	11
Operating Segments \| Nitrogen Fertilizer \| Freight revenue
Disaggregation of Revenue [Line Items]
Revenue from product sales	9	10	24	24
Operating Segments \| Nitrogen Fertilizer \| Other
Disaggregation of Revenue [Line Items]
Revenue from product sales	2	2	8	8
Operating Segments \| Nitrogen Fertilizer \| Crude oil sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	0	0	0	0
Operating Segments \| Nitrogen Fertilizer \| Other revenue
Disaggregation of Revenue [Line Items]
Other revenue	0	0	0	0
Other / Elimination
Disaggregation of Revenue [Line Items]
Net sales	(4)	(1)	(8)	(5)
Other / Elimination \| Revenue from product sales
Disaggregation of Revenue [Line Items]
Revenue from product sales	(4)	(1)	(8)	(5)
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	0	0	0	0
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 \| Other 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
Disaggregation of Revenue [Line Items]
Revenue from product sales	(4)	(1)	(8)	(5)
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	$ 0	$ 0