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Compensation Plans - Stock Based Compensation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense recognized $ 23 $ 21 $ 18  
Share-based payment arrangement, amount capitalized 3 $ 2 2  
Deferred compensation cost $ 28      
Total unrecognized compensation cost, period of recognition 1 year 4 months 24 days      
Executive Vice President        
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) 26,000,000      
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) 17,000,000