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Deferred Revenue - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Contract with Customer, Liability [Abstract]      
Total $ 217 $ 216 $ 198
Deferred revenue, current 135 125  
Deferred revenue, noncurrent 82 91  
Deferred revenue recognized $ 114 $ 100