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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Estimated Forfeiture Rate Non Officers 5.30%    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 9 months    
RSUs (Number of Shares):      
Nonvested at beginning of period 1,210    
Vested (634) (806) (996)
Forfeited and expired (109)    
Granted 1,091    
Nonvested at end of period 1,558 1,210  
Vested and expected to vest at end of period 1,420    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 26    
Weighted Average Grant Date Fair Value (in dollars per share):      
Nonvested at beginning of period $ 17.53    
Vested 15.63    
Forfeited and expired 23.46    
Granted 26.46    
Nonvested at end of period 24.14 $ 17.53  
Vested and expected to vest at end of period $ 24.10    
Nonvested at end of period, weighted average remaining vesting term 2 years 3 months 14 days    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Related To Current Current Year Grants Per Year $ 27    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Related To Current Current Year Grants Per Year, Weighted Average Period of Amortization 3 years 4 months 24 days