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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Customary payment terms   30 days  
Customer advances $ 313 $ 313 $ 89
Continuous Basis      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 23 $ 64  
Point Lisas Nitrogen Limited [Member] | Operating equity method investments      
Disaggregation of Revenue [Line Items]      
Obligation to purchase ammonia (as a percent)   50% of the ammonia produced by PLNL