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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 22 $ 20 $ 8
Performance Cash Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock units vesting rule measurement period 3 years 3 years 3 years
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Estimated Forfeiture Rate Non Officers 11.95%    
Period of straight-line expense - RSU's 3 years    
Pretax compensation expense $ 10 $ 11 $ 17
Award vesting period 3 years 3 years 3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 10    
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 $ 13.73 $ 10.80  
Weighted Average Grant Date Fair Value $ 17.53    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Related To Current Current Year Grants Per Year $ 10    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option grant price as percent of market price 100.00% 100.00% 100.00%
Award vesting period 3 years 3 years 3 years
Stock option contractual term 10 years 10 years 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 $ 17.53 $ 10.55 $ 11.93
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% 0.00% 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% 200.00% 200.00%