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Share-Based Payments Textual (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Cash paid for SARs exercised   $ 13
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards issued (shares) 0.4  
Restricted Stock [Member] | Service Condition [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards issued (shares) 0.1  
Restricted Stock [Member] | Service and Performance Condition [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance measurement period 2 years  
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (shares) 0.1  
Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of SARs   $ 86