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Stock-Based Compensation - Additional Information (Details)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
performance_criteria
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Stock-Based Compensation      
Compensation cost that has been charged against income $ 18 $ 18 $ 20
Total income tax benefit recognized 4 7 7
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 $ 22 21 24
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 $ 6 5 4
Cash flow effect, cash used to settle awards $ 4 $ 5 $ 5
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%    
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%    
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) | shares 4.6    
Common shares available for issuance (in shares) | shares 1.5