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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ 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]      
Pretax compensation expense $ 21 $ 22 $ 20
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Estimated Forfeiture Rate Non Officers 7.23%    
Pretax compensation expense $ 10 $ 10 $ 11
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 12    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 9 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 17.53 $ 13.73  
Weighted Average Grant Date Fair Value $ 20.75    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Related To Current Current Year Grants Per Year $ 11    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option grant price as percent of market price 100.00%    
Stock option contractual term 10 years    
Weighted Average [Member] | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 20.75 $ 17.53 $ 10.55
Minimum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Payout Range 0.00%    
Maximum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Payout Range 200.00%