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Revenue - Deferred Revenue (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Balance at beginning of period $ 87
Less:  
Balance at end of period 81
Prepaid contracts, payment collected 14
Nitrogen Fertilizer  
Change in Contract with Customer, Liability [Roll Forward]  
Balance at beginning of period 87
Add:  
New prepay contracts entered into during the period 15
Less:  
Revenue recognized that was included in the contract liability balance at the beginning of the period (17)
Revenue recognized related to contracts entered into during the period (4)
Balance at end of period $ 81