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Revenue from Contracts with Customers - Contract Cost Balances (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Capitalized Contract Cost [Line Items]      
Current contract cost assets $ 30,000,000 $ 62,000,000  
Non-current contract cost assets 98,000,000 $ 85,000,000 $ 0
Contract cost, amortization $ 44,000,000    
Minimum      
Capitalized Contract Cost [Line Items]      
Capitalized contract cost, amortization period 1 year    
Maximum      
Capitalized Contract Cost [Line Items]      
Capitalized contract cost, amortization period 4 years