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Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 9 $ 9
Income tax benefit related to stock-based compensation expense 3 2
Tax benefit realized from stock options exercise and similar awards 2 6
Cost of providing services    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 2 2
Sales and marketing    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 1 2
General and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 5 4
Systems development and programming costs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1 $ 1