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Revenue - Deferred Revenue (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Balance at December 31, 2019 $ 28
Less:  
Balance at December 31, 2020 31
Nitrogen Fertilizer Segment  
Change in Contract with Customer, Liability [Roll Forward]  
Balance at December 31, 2019 28
Add:  
New prepay contracts entered into during the period 56
Less:  
Revenue recognized that was included in the contract liability balance at the beginning of the period (27)
Revenue recognized related to contracts entered into during the period (26)
Balance at December 31, 2020 31
Prepaid contracts, payment collected $ 33