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Revenue Costs to Obtain a Contract (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capitalized Contract Cost, Net $ 72 $ 36  
Capitalized Contract Cost, Amortization 6 3 $ 1
Other Current Assets      
Capitalized Contract Cost, Net 8 5  
Other Long-Term Assets      
Capitalized Contract Cost, Net $ 64 $ 31