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Stock-based Compensation Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2016
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation | $     $ 32 $ 50 $ 153
Common Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 9.43 $ 9.44 $ 5.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number     400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     0   0
Employee Stock Purchase Plan, Number of Shares Sold   3,100,000 600,000 700,000 3,300,000
Common Class M          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares         $ 10.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $     $ 11 $ 29 $ 117
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     500,000    
Common Class M | Share-based Compensation Award, Tranche One, Period One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%    
Common Class M | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized share-based compensation expense | $     $ 5    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $     $ 5 $ 16 92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number     3,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Eligible Vesting Period, Following Qualifying Termination     6 months    
Unrecognized share-based compensation expense, period for recognition     1 year 18 days    
Common Class M | Share-based Compensation Award, Tranche One, Period One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%    
Common Class M | Share-based Compensation Award, Tranche One, Period Three [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%    
Common Class M | Share-based Compensation Award, Tranche One, Period Four [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%    
Common Class M | Share-based Compensation Award, Tranche One, Period Five [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%    
Common Class M | Share-based Compensation Award, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0  
Unrecognized share-based compensation expense | $     $ 4    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $     $ 3 $ 40 $ 122
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number     4,300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     300,000    
Unrecognized share-based compensation expense, period for recognition     230 days    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 47.97 $ 51.28 $ 33.95
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested | $     $ 3 $ 2 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     200,000    
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Discounted stock purchase price     85.00%    
Number of shares reserved for issuance     3,800,000    
2016 Share Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares reserved for issuance     3,500,000    
2016 Modification [Member] | Common Class M          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected 27        
Stock-based compensation | $ $ 83        
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost | $ $ 42        
Long Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized share-based compensation expense | $     $ 16    
Unrecognized share-based compensation expense, period for recognition     350 days