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Stock-Based Employee Compensation (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) plan $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock-based compensation plans | plan | 1 |  |
Maximum number of award to be granted per individual (in shares) | shares | 500,000 |  |
Total compensation expense | $ 126,000,000 | $ 36,000,000 | $ 64,000,000
Maximum aggregate number of shares available under the employee stock purchase plan (in shares) | shares | 2,800,000 |  |
Purchase price for each share of common stock as percentage of the average of the market price | 85.00% |  |
Shares of common stock issued under the ESPP plan (in shares) | shares | 151,989 | 171,279 | 136,480
Weighted-average price of shares of common stock issued under the ESPP plan (in dollars per share) | $ / shares | $ 71.23 | $ 44.01 | $ 70.95
Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum value of awards that can be granted to participant in any fiscal year | $ 750,000 |  |
Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation expense | $ 0 | $ 0 | $ 0
Stock Option | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Stock Option | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares (as a percent) | 200.00% |  |
Shares issued (in shares) | shares | 314,197 |  |
Stock-based awards conversion ratio | 1 |  |
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) | $ / shares | $ 73.96 | $ 79.80 | $ 84.83
Fair value of shares released on vesting of restricted stock units | $ 7,000,000 | $ 5,000,000 | $ 6,000,000
Total unrecognized compensation cost | $ 34,000,000 |  |
Weighted-average period of unrecognized compensation cost to be recognized (in years) | 1 year 3 months 21 days |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares (as a percent) | 300.00% |  |
Shares issued (in shares) | shares | 354,822 |  |
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) | $ / shares | $ 74.59 | $ 79.80 | $ 84.83
Total unrecognized compensation cost | $ 3,000,000 |  |
Weighted-average period of unrecognized compensation cost to be recognized (in years) | 1 year 2 months 1 day |  |
Restricted Stock | Senior Officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares (as a percent) | 200.00% |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based awards conversion ratio | 1 |  |
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) | $ / shares | $ 75.26 | $ 72.21 | $ 85.08
Fair value of shares released on vesting of restricted stock units | $ 33,000,000 | $ 30,000,000 | $ 36,000,000
Total unrecognized compensation cost | $ 38,000,000 |  |
Weighted-average period of unrecognized compensation cost to be recognized (in years) | 10 months 28 days |  |
2008 Equity Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares authorized for issuance under stock-based compensation plans (in shares) | shares | 10,083,570 |  |

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