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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Revenue from related parties $ 20 $ 22 $ 10
Board of Directors Chairman      
Related Party Transaction [Line Items]      
Payments to service providers with common board members $ 5 $ 6 $ 7