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Share-Based Compensation (RSU Activity) (Details) - RSUs - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of straight-line expense, 2015 RSU's 3 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 23 months    
RSUs (Number of Shares):      
Nonvested at beginning of period 1,997    
Vested (954) (1,037) (942)
Forfeited and expired (236)    
Granted 1,585    
Nonvested at end of period 2,392 1,997  
Vested at end of period 0    
Vested and expected to vest at end of period 2,105    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 16    
Weighted Average Grant Date Fair Value (in dollars per share):      
Nonvested at beginning of period $ 13.20    
Vested 13.01    
Forfeited and expired 12.71    
Granted 12.03 $ 14.60 $ 11.19
Nonvested at end of period 12.55 $ 13.20  
Vested at end of period 0.00    
Vested and expected to vest at end of period $ 12.55    
Nonvested at end of period, weighted average remaining vesting term 20 months