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Employment Benefit Plans Stock Compensation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based compensation expense [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,255,643    
Share Based Compensation Arrangement Shares Available for Future Issuance at Target 2,691,618    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense $ 14 $ 11 $ 12
Total stock-based compensation (after-tax) $ 14 $ 11 12
Common stock, shares authorized 130,000,000 130,000,000  
2013 Plan      
Share-based compensation expense [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,000,000    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,000,000    
2021 Plan      
Share-based compensation expense [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,475,000    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,475,000    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense $ 5 $ 3 4
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense 10 8 8
Retained Earnings [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Expense $ 0 $ 0 $ 0