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Revenue - Deferred Revenue (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Balance at beginning of period $ 28
Less:  
Balance at end of period 3
Prepaid contracts, payment collected 17
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 18
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 16
Balance at end of period $ 3