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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, 2015
Dec. 31, 2014
Dec. 31, 2013
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) 4,550    
Shares granted, Number of Shares (in shares) 2,473    
Shares vested, Number of Shares (in shares) (1,556)    
Shares forfeited, Number of Shares (in shares) (512)    
Unvested shares, Ending balance, Number of Shares (in shares) 4,955 4,550  
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) $ 27.78    
Shares granted, Weighted Average Grant-Date Fair Value per Share (in dollars per share) 29.40 $ 31.85 $ 25.64
Shares vested, Weighted Average Grant-Date Fair Value per Share (in dollars per share) 22.27    
Shares forfeited, Weighted Average Grant-Date Fair Value per Share (in dollars per share) 30.03    
Unvested shares, Ending balance, Weighted Average Grant-Date Fair Value per Share (in dollars per share) $ 30.08 $ 27.78  
Total intrinsic value of shares vested and distributed $ 44 $ 66 $ 33
Total unrecognized compensation $ 79    
Total unrecognized compensation cost, period of recognition 1 year 1 month 7 days    
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) 1,401    
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) $ 29.05    
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) 1,072    
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) $ 29.86    
Minimum [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 44 months    
Performance Period from 2013 to 2014 [Member] | Restricted Stock, Performance-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) 1,000