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Stock-Based Compensation (Details)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2017
shares
Dec. 31, 2012
shares
Dec. 31, 2018
USD ($)
performance_criteria
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Stock-Based Compensation          
Compensation cost that has been charged against income | $     $ 20 $ 21 $ 19
Total income tax benefit recognized | $     7 15 10
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $     $ 9    
Expected weighted-average period of recognition of unrecognized compensation cost     2 years    
Total fair value of shares vested | $     $ 24 22 22
Performance Shares          
Number of performance element criteria | performance_criteria     2    
Performance period     3 years    
Restricted stock unit awards          
Stock-Based Compensation          
Share-based liabilities paid | $     $ 4 4 3
Cash flow effect, cash used to settle awards | $     $ 5 $ 4 $ 3
Restricted Stock Units, Stock Grants and Stock Units          
Vesting period     4 years    
Percentage of cash that the participant may elect as a dividend for the first option available under the plan     50.00%    
Percentage of stock that the participant may elect as dividend under second option of plan     50.00%    
Restricted Stock Units, Stock Grants, and Stock Units          
Restricted Stock Units, Stock Grants and Stock Units          
Granted (in shares)     132,997    
Shares released during period (in shares)     5,356    
Performance Shares          
Restricted Stock Units, Stock Grants and Stock Units          
Granted (in shares)     171,708    
Shares released during period (in shares)     9,542    
Performance Shares | Maximum          
Performance Shares          
Exact number of shares issued as a percentage of the target award     200.00%    
Performance Shares | Minimum          
Performance Shares          
Exact number of shares issued as a percentage of the target award     0.00%    
Officers and Key Employees | Restricted stock unit awards          
Restricted Stock Units, Stock Grants and Stock Units          
Percentage of fully transferable shares of stock that the participant may elect as a deferral for the first option available under the plan     100.00%    
Percentage of fully transferable shares of stock in that participant may receive cash     100.00%    
Chief Executive Officer | Retention units          
Restricted Stock Units, Stock Grants and Stock Units          
Granted (in shares)   50,617      
Additional shares to be granted as retention award if performance requirements are met (in shares)         33,745
Shares released during period (in shares) 84,362        
Non-Officer Board of Director Member | Restricted stock unit awards          
Restricted Stock Units, Stock Grants and Stock Units          
Percentage of fully transferable shares of stock that the participant may elect as a deferral for the first option available under the plan     100.00%    
Percentage of cash that the participant may elect as a dividend for the first option available under the plan     100.00%    
Percentage of stock that the participant may elect as dividend under second option of plan     50.00%    
Percentage of cash that the participant may elect as a dividend equivalent deferral for the first option available under the plan     50.00%    
Percentage of fully transferable shares of stock that the participant may elect as a dividend equivalent deferral for the first option available under the plan     50.00%    
2012 Plan          
Stock-Based Compensation          
Common shares available for grant (in shares)     4,600,000    
Common shares available for issuance (in shares)     1,900,000