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Stock-Based Compensation - Additional Information (Details) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) performance_criteria shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Stock-Based Compensation |  |  |
Compensation cost that has been charged against income | $ 18 | $ 18 | $ 18
Total income tax benefit recognized | 3 | 4 | 7
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 11 |  |
Expected weighted-average period of recognition of unrecognized compensation cost | 2 years |  |
Total fair value of shares vested | $ 22 | 22 | 21
Performance Share Awards |  |  |
Number of performance element criteria | performance_criteria | 2 |  |
Performance period | 3 years |  |
Restricted Stock Units |  |  |
Stock-Based Compensation |  |  |
Share-based liabilities paid | $ 4 | 6 | 5
Cash flow effect, cash used to settle awards | $ 3 | $ 4 | $ 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 | Minimum |  |  |
Performance Share Awards |  |  |
Exact number of shares issued as a percentage of the target award | 0.00% |  |
Performance Shares | Maximum |  |  |
Performance Share Awards |  |  |
Exact number of shares issued as a percentage of the target award | 200.00% |  |
Officers and Key Employees | Restricted Stock Units |  |  |
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 Units |  |  |
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 | 1.5 |  |
Common shares available for issuance (in shares) | shares | 1.2 |  |

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