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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Estimated Forfeiture Rate Non Officers 7.23%    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 9 months 18 days    
RSUs (Number of Shares):      
Nonvested at beginning of period 1,484    
Vested (806) (996) (1,428)
Forfeited and expired (47)    
Granted 579    
Nonvested at end of period 1,210 1,484  
Vested and expected to vest at end of period 1,104    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 12    
Weighted Average Grant Date Fair Value (in dollars per share):      
Nonvested at beginning of period $ 13.73    
Vested 12.95    
Forfeited and expired 15.71    
Granted 20.75    
Nonvested at end of period 17.53 $ 13.73  
Vested and expected to vest at end of period $ 17.35    
Nonvested at end of period, weighted average remaining vesting term 1 year 4 months 24 days    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Related To Current Current Year Grants Per Year $ 11