Revenue Recognition - Revenue by Product and by Geography (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 971	$ 1,001
North America
Disaggregation of Revenue [Line Items]
Net sales	820	842
Europe and Other
Disaggregation of Revenue [Line Items]
Net sales	151	159
Ammonia
Disaggregation of Revenue [Line Items]
Net sales	193	187
Ammonia | North America
Disaggregation of Revenue [Line Items]
Net sales	154	160
Ammonia | Europe and Other
Disaggregation of Revenue [Line Items]
Net sales	39	27
Granular Urea
Disaggregation of Revenue [Line Items]
Net sales	337	343
Granular Urea | North America
Disaggregation of Revenue [Line Items]
Net sales	331	335
Granular Urea | Europe and Other
Disaggregation of Revenue [Line Items]
Net sales	6	8
UAN
Disaggregation of Revenue [Line Items]
Net sales	235	256
UAN | North America
Disaggregation of Revenue [Line Items]
Net sales	230	242
UAN | Europe and Other
Disaggregation of Revenue [Line Items]
Net sales	5	14
AN
Disaggregation of Revenue [Line Items]
Net sales	116	127
AN | North America
Disaggregation of Revenue [Line Items]
Net sales	46	46
AN | Europe and Other
Disaggregation of Revenue [Line Items]
Net sales	70	81
Other
Disaggregation of Revenue [Line Items]
Net sales	90	88
Other | North America
Disaggregation of Revenue [Line Items]
Net sales	59	59
Other | Europe and Other
Disaggregation of Revenue [Line Items]
Net sales	$ 31	$ 29