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Revenue - Deferred Revenue (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2020
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Balance at beginning of period $ 28
Less:  
Balance at end of period 38
Prepaid contracts, payment collected 16
Nitrogen Fertilizer  
Change in Contract with Customer, Liability [Roll Forward]  
Balance at beginning of period 28
Add:  
New prepay contracts entered into during the period 17
Less:  
Revenue recognized that was included in the contract liability balance at the beginning of the period 6
Revenue recognized related to contracts entered into during the period 1
Balance at end of period $ 38