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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Restricted Stock Unit Activity (Excluding Dividend Equivalents)
Restricted Share Unit Activity
Nonvested Share Units
Number of
Share Units
Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2023932,728 $54.16 
Granted192,362 84.59 
Vested(337,274)48.49 
Forfeited(7,335)54.81 
Nonvested at December 31, 2024780,481 $64.03 
Performance-Based Restricted Share Unit Activity
Performance-Based Restricted Share Units
Number of
Performance-Based Share Units
Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2023677,856 $64.62 
Granted (1)478,324 94.56 
Vested (2)(404,114)41.91 
Forfeited— — 
Nonvested at December 31, 2024 (3)752,066 $72.39 
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(1)    Includes 118,086 adjusted book value performance-based restricted share units and 177,130 TSR performance-based restricted share units that were granted prior to 2024 at a weighted average grant date fair value of $44.01 and $60.06, respectively, but met performance hurdles and vested during 2024. The weighted average grant date fair value per share excludes these shares.
(2)    Excludes 295,216 TSR performance-based restricted share units that vested during 2024 but were not delivered.
(3)    Excludes 157,854 performance-based restricted share units that have met performance hurdles and vest in February 2025. Includes 295,216 TSR performance-based restricted share units that vested during 2024 but will be delivered in 2025.
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
The following are significant assumptions used in determining the fair value of the performance-based restricted share units tied to relative TSR.

Years Ended December 31,
202420232022
Expected term3.00 years3.00 years2.85 years
Expected volatility20.72 %–87.00%29.22 %–110.25%27.19 %–78.96%
Dividend yield 0.00%0.00%0.00%
Risk-free-rates4.38%4.38%1.74%
Grant-date fair value per share$104.27$80.80$83.97
Restricted Stock Award Activity
Restricted Share Award Activity
Nonvested Shares
Number of
Shares
Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 202338,464 $52.26 
Granted21,413 77.54 
Vested(38,464)52.26 
Forfeited— — 
Nonvested at December 31, 202421,413 $77.54 
Stock Purchase Plan Stock Purchase Plan
Year Ended December 31,
202420232022
(dollars in millions)
Proceeds from purchase of shares by employees$2.2 $2.2 $2.4 
Number of shares issued by the Company33,348 47,204 53,453 
Share-Based Compensation Expense Summary
Share-Based Compensation Expense Summary
Year Ended December 31,
202420232022
(in millions)
Share‑based compensation expense$34 $36 $39 
Share‑based compensation capitalized as DAC2 3 3 
Income tax benefit5 5 6