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Stock-Based Compensation Restricted Stock Units and Performance Deferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 01, 2019
Restricted Stock Units and Performance Deferred Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested RSUs and PSUs at beginning of period 3,834,000 3,834,000 3,834,000 3,757,000
RSUs and PSUs granted during the period 80,000      
RSUs and PSUs forfeited during the period (3,000)      
Nonvested RSUs and PSUs at end of period 3,834,000 3,834,000    
Weighted Average Grant Date Fair Value, Nonvested RSUs and PSUs beginning of period $ 35.34 $ 35.34 $ 35.34 $ 35.56
Weighted Average Grant Date Fair Value, RSUs and PSUs granted during the period 25.03      
Weighted Average Grant Date Fair Value, RSUs and PSUs forfeited during the period 38.78      
Weighted Average Grant Date Fair Value, Nonvested RSUs and PSUs end of period $ 35.34 $ 35.34    
Unrecognized pre-tax compensation expense - RSUs and PSUs     $ 59  
Unrecognized pre-tax compensation expense, period for recognition   1 year 8 months 1 day    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Equity award conversion ratio   1    
Award Requisite Service Period   6 months    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Management [Member] | Restricted Stock Units (RSUs) [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Management [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Minimum [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year