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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Restricted Stock Unit Activity (Excluding Dividend Equivalents) | Restricted Stock Unit Activity
Nonvested Stock Units |  | Number of Stock Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2022 | 1,067,066 |  |  | $ | 49.18 |
Granted | 270,741 |  |  | 61.26 |
Vested | (399,607) |  |  | 45.86 |
Forfeited | (5,472) |  |  | 55.69 |
Nonvested at December 31, 2023 | 932,728 |  |  | $ | 54.16 |
Performance Restricted Stock Unit Activity
Performance Restricted Stock Units |  | Number of Performance Share Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2022 | 635,385 |  |  | $ | 54.26 |
Granted (1) | 293,950 |  |  | 71.34 |
Vested (2) | (251,479) |  |  | 44.20 |
Forfeited | — |  |  | — |
Nonvested at December 31, 2023 (3) | 677,856 |  |  | $ | 64.62 |
____________________ (1) Includes 86,501 ABV performance restricted stock units and 81,441 TSR performance restricted stock units that were granted prior to 2023 at a weighted average grant date fair value of $43.09 and $38.96, respectively, but met performance hurdles and vested during 2023. The weighted average grant date fair value per share excludes these shares. (2) Excludes 167,942 TSR performance restricted stock units that vested during 2023 but were not delivered. (3) Excludes 295,216 performance restricted stock units that have met performance hurdles and vested in February 2024. Includes 167,942 TSR performance restricted stock units that vested during 2023 but will be delivered in 2024.
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions | The following are significant assumptions used in determining the fair value of the performance restricted stock units tied to relative TSR.
|  | Years Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Expected term |  | 3.00 years |  | 2.85 years |  | 2.85 years
Expected volatility |  | 29.22 | % | – | 110.25% |  | 27.19 | % | – | 78.96% |  | 26.55 | % | – | 65.84%
Dividend yield |  | 0.00% |  | 0.00% |  | 0.00%
Risk-free-rates |  | 4.38% |  | 1.74% |  | 0.22%
Grant-date fair value |  | $80.80 |  | $83.97 |  | $60.06
Restricted Stock Award Activity | Restricted Stock Award Activity
Nonvested Shares |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2022 | 36,403 |  |  | $ | 59.47 |
Granted | 38,464 |  |  | 52.26 |
Vested | (36,403) |  |  | 59.47 |
Forfeited | — |  |  | — |
Nonvested at December 31, 2023 | 38,464 |  |  | $ | 52.26 |
Stock Purchase Plan | Stock Purchase Plan
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| (dollars in millions)
Proceeds from purchase of shares by employees | $ | 2.2 |  |  | $ | 2.4 |  |  | $ | 2.1 |
Number of shares issued by the Company | 47,204 |  |  | 53,453 |  |  | 67,615 |
Share-Based Compensation Expense Summary | Share-Based Compensation Expense Summary
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| (in millions)
Share‑based compensation expense | $ | 36 |  |  | $ | 39 |  |  | $ | 27 |
Share‑based compensation capitalized as DAC | 3 |  |  | 3 |  |  | 2 |
Income tax benefit | 5 |  |  | 6 |  |  | 4 |

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