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Equity Method Investment-Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity method investments        
Obligation to purchase ammonia (as a percent)     50.00%  
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority $ (108)   $ (108)  
Operating equity method investments | Maximum | Property, plant and equipment        
Equity method investments        
Number of years that the increased basis for property, plant and equipment and identifiable intangibles will be amortized     13 years  
Point Lisas Nitrogen Limited (PLNL) | Operating equity method investments        
Equity method investments        
Ownership interest (as a percent) 50.00%   50.00%  
Equity Method Investment $ 86   $ 86  
Carrying value of investments in excess of the entity's share of the affiliates' book value 43   43  
Purchases of ammonia from PLNL $ 14 $ 12 37 $ 46
Point Lisas Nitrogen Limited (PLNL) | Operating equity method investments | The Board of Inland Revenue [Member]        
Equity method investments        
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority   16   16
Income Tax Examination, Estimate of Possible Loss     $ 12  
Point Lisas Nitrogen Limited (PLNL) | The Board of Inland Revenue [Member]        
Equity method investments        
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority   $ 32   $ 32