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Deferred Contract Costs (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Capitalized Contract Cost [Line Items]      
Deferred contract costs, net $ 392,000,000   $ 354,000,000
Amortization of contract costs 29,000,000 $ 21,000,000  
Deferred contract costs impairment 0 $ 0  
Installations and conversions in progress      
Capitalized Contract Cost [Line Items]      
Deferred contract costs, net 115,000,000   104,000,000
Incremental contract origination costs completed, net      
Capitalized Contract Cost [Line Items]      
Deferred contract costs, net 150,000,000   127,000,000
Costs to fulfill a contract, net      
Capitalized Contract Cost [Line Items]      
Deferred contract costs, net $ 127,000,000   $ 123,000,000