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Compensation Plans - Stock Based Compensation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense recognized $ 18 $ 15 $ 14  
Deferred compensation cost $ 26      
Total unrecognized compensation cost, period of recognition 2 years      
Executive Vice President [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense recognized $ 1      
Former Chairman, Chief Executive Officer and President        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense recognized   $ 2    
Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense recognized     $ 1  
2006 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares available for future awards (in shares)       0
2014 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares available for future awards (in shares) 28,000,000      
Maximum number of shares reserved for awards (in shares)       33,000,000
Maximum number of shares available for future awards to be issued as restricted stock and performance restricted stock unit (in shares) 19,000,000