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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of restricted stock activity under the Plan | A summary of restricted stock activity during the year ended December 31, 2023 is presented below.
| Restricted Stock Awards |  | Restricted Stock Units |  | Performance Restricted Stock Units
| Shares |  | Weighted- Average Grant-Date Fair Value |  | Shares |  | Weighted- Average Grant-Date Fair Value |  | Shares |  | Weighted- Average Grant-Date Fair Value
Outstanding as of December 31, 2022 | 16,736 |  |  | $ | 95.59 |  |  | 546,680 |  |  | $ | 53.21 |  |  | 411,685 |  |  | $ | 63.95 |
Granted | 24,873 |  |  | 74.79 |  |  | 182,122 |  |  | 81.44 |  |  | 181,160 |  |  | 93.61 |
Restrictions lapsed (vested)(1) | (16,736) |  |  | 95.59 |  |  | (281,791) |  |  | 49.58 |  |  | (184,400) |  |  | 59.69 |
Forfeited | — |  |  | — |  |  | (14,372) |  |  | 64.86 |  |  | — |  |  | — |
Outstanding as of December 31, 2023 | 24,873 |  |  | 74.79 |  |  | 432,639 |  |  | 67.07 |  |  | 408,445 |  |  | 79.03 |
_______________________________________________________________________________ (1)For performance restricted stock units, the shares represent the performance restricted stock units granted in 2020, for which the three-year performance period ended December 31, 2022.
Summary of stock option activity under the plan | A summary of stock option activity during the year ended December 31, 2023 is presented below:
| Shares |  | Weighted- Average Exercise Price |  |  |  |
Outstanding as of December 31, 2022 | 162,036 |  |  | $ | 37.72 |  |  |  |  |
Exercised | (39,106) |  |  | 41.99 |  |  |  |  |
Outstanding as of December 31, 2023 | 122,930 |  |  | 36.36 |  |  |  |  |
Exercisable as of December 31, 2023 | 122,930 |  |  | 36.36 |  |  |  |  |
| Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value(1) (in millions) |  |  |  |
Outstanding as of December 31, 2023 | 2.2 |  | $ | 5 |  |  |  |  |
Exercisable as of December 31, 2023 | 2.2 |  | 5 |  |  |  |  |
_____________________________________________________________________________ (1)The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $79.50 as of December 31, 2023, which would have been received by the option holders had all option holders exercised their options as of that date.
Summary of selected amounts pertaining to stock option exercises | Selected amounts pertaining to stock option exercises are as follows:
| Year ended December 31,
| 2023 |  | 2022 |  | 2021
| (in millions)
Cash received from stock option exercises | $ | 2 |  |  | $ | 106 |  |  | $ | 64 |
Actual tax benefit realized from stock option exercises | — |  |  | 23 |  |  | 9 |
Pre-tax intrinsic value of stock options exercised | 1 |  |  | 100 |  |  | 39 |
Summary of information about stock options outstanding and exercisable |
| Year ended December 31,
| 2023 |  | 2022 |  | 2021
| (in millions)
Cash received from stock option exercises | $ | 2 |  |  | $ | 106 |  |  | $ | 64 |
Actual tax benefit realized from stock option exercises | — |  |  | 23 |  |  | 9 |
Pre-tax intrinsic value of stock options exercised | 1 |  |  | 100 |  |  | 39 |
Summary of selected amounts pertaining to restricted stock that vested | .
Summary of stock-based compensation costs and related income tax benefits | The following table summarizes stock-based compensation costs and related income tax benefits:
| Year ended December 31,
| 2023 |  | 2022 |  | 2021
| (in millions)
Stock-based compensation expense | $ | 37 |  |  | $ | 41 |  |  | $ | 30 |
Income tax benefit | (9) |  |  | (9) |  |  | (7) |
Stock-based compensation expense, net of income taxes | $ | 28 |  |  | $ | 32 |  |  | $ | 23 |

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- Definition Tabular disclosure of the amounts pertaining to restricted stock vested during the period. May include actual tax benefit realized and fair value of restricted stock vested. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts pertaining to stock option exercises during the period. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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