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Revenue - Deferred Revenue (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Balance at beginning of period $ 31
Less:  
Balance at end of period 34
Prepaid contracts, payment collected 50
Nitrogen Fertilizer  
Change in Contract with Customer, Liability [Roll Forward]  
Balance at beginning of period 31
Add:  
New prepay contracts entered into during the period 54
Less:  
Revenue recognized that was included in the contract liability balance at the beginning of the period (30)
Revenue recognized related to contracts entered into during the period (21)
Balance at end of period $ 34