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Revenue - Deferred Revenue (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2018
USD ($)
Less:  
Balance at June 30, 2018 $ 11
CVR Partners  
Change in Contract with Customer, Liability [Roll Forward]  
Balance at January 1, 2018 34
Add:  
New prepay contracts entered into during the period 14
Less:  
Revenue recognized that was included in the contract liability balance at the beginning of the period 32
Revenue recognized related to contracts entered into during the period 5
Other changes 0
Balance at June 30, 2018 $ 11