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Share-Based Payments Textual (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Feb. 28, 2019
Sep. 30, 2019
May 31, 2019
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash paid for SARs exercised $ 13 $ 55    
Document Period End Date       Sep. 30, 2019
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards issued (shares)     0.5  
Restricted Stock [Member] | Service Condition [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards issued (shares)     0.2  
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   $ 82   $ 82