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Employee Stock Compensation Plans - Restricted Stock and Restricted Stock Units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   33.90%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.21%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 14.93  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Unvested shares, Beginning balance, Number of Shares (in shares) 7,469    
Shares granted, Number of Shares (in shares) 2,211    
Shares vested, Number of Shares (in shares) (1,989)    
Shares forfeited, Number of Shares (in shares) (533)    
Unvested shares, Ending balance, Number of Shares (in shares) 7,158 7,469  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Unvested shares, Beginning balance, Weighted Average Grant-Date Fair Value per Share (in dollars per share) $ 24.70    
Shares granted, Weighted Average Grant-Date Fair Value per Share (in dollars per share) 46.95 $ 20.45 $ 29.40
Shares vested, Weighted Average Grant-Date Fair Value per Share (in dollars per share) 30.23    
Shares forfeited, Weighted Average Grant-Date Fair Value per Share (in dollars per share) 28.12    
Unvested shares, Ending balance, Weighted Average Grant-Date Fair Value per Share (in dollars per share) $ 29.78 $ 24.70  
Total intrinsic value of shares vested and distributed $ 87 $ 42 $ 44
Total unrecognized compensation $ 98    
Total unrecognized compensation cost, period of recognition 11 months    
Restricted Stock, Service-based [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Shares granted, Number of Shares (in shares) 1,030    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Shares granted, Weighted Average Grant-Date Fair Value per Share (in dollars per share) $ 46.80    
Restricted Stock, Performance-based [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award requisite service period 12 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Shares granted, Number of Shares (in shares) 1,181    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Shares granted, Weighted Average Grant-Date Fair Value per Share (in dollars per share) $ 47.08    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 60 months    
Minimum [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 48 months    
Minimum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award requisite service period 36 months    
Maximum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award requisite service period 48 months