XML 185 R147.htm IDEA: XBRL DOCUMENT v3.8.0.1
Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 8 $ 10 $ 8
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option grant price as percent of market price     100.00%
Award vesting period     3 years
Award vesting rights percentage     33.00%
Stock option contractual term     10 years
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax compensation expense $ 17 $ 14 $ 13
Award vesting period 3 years    
Award vesting rights percentage 33.00%    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 17    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months    
Estimated forfeiture rate 10.35%    
Compensation cost not yet recognized related to current year grants per year $ 17    
Weighted Average Grant Date Fair Value $ 11.93 $ 9.42 $ 12.03
Performance Cash Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock units vesting rule measurement period 3 years    
PSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award payout range 0.00%    
PSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award payout range 200.00%