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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of Stock Options Outstanding and Exercised Under Stock Incentive Plans
The following is a summary of stock options outstanding and exercised under prior and existing stock incentive plans of the Company:
Year Ended December 31Stock
 Options/Shares		Weighted- Average Exercise PriceWeighted-Average Remaining Contractual TermAggregate Intrinsic Value (in millions)
 
2024
Number outstanding at beginning of period2,838,285 $45.28 
Exercised(769,636)42.04 
Cancelled(a)
(20,402)46.15 
Number outstanding at end of period(b)
2,048,247 $46.49 1.4$3 
Exercisable at end of period2,048,247 $46.49 1.4$3 
2023
Number outstanding at beginning of period3,253,090 $44.42 
Exercised(399,329)38.15 
Cancelled(a)
(15,476)47.88 
Number outstanding at end of period(b)
2,838,285 $45.28 2.0$— 
Exercisable at end of period2,838,285 $45.28 2.0$— 
2022
Number outstanding at beginning of period3,890,131 $42.58 
Exercised(624,729)32.87 
Cancelled(a)
(12,312)50.97 
Number outstanding at end of period(b)
3,253,090 $44.42 2.7$— 
Exercisable at end of period3,253,090 $44.42 2.7$— 
Note: The Company did not grant any stock option awards during 2024, 2023, and 2022.
(a)Options cancelled include both non-vested (i.e., forfeitures) and vested options.
(b)Outstanding options include stock-based awards that may be forfeited in future periods. The impact of the estimated forfeitures is reflected in compensation expense.
Stock Option Activity
The following summarizes certain stock option activity of the Company:
Year Ended December 31 (Dollars in Millions)202420232022
Fair value of options vested$— $— $— 
Intrinsic value of options exercised3 2 15 
Cash received from options exercised32 15 21 
Tax benefit realized from options exercised1 1 4 
Stock Options Outstanding Additional Information
Additional information regarding stock options outstanding as of December 31, 2024, is as follows:
 Outstanding OptionsExercisable Options
Range of Exercise PricesSharesWeighted- Average Remaining Contractual Life (Years)Weighted- Average Exercise PriceSharesWeighted- Average Exercise Price
$35.01—$40.00
915,3641.1$39.49 915,364$39.49 
$40.01—$45.00
299,0920.144.30 299,09244.30 
$45.01—$50.00
————— 
$50.01—$55.01
833,7912.154.96 833,79154.96 
 2,048,2471.4$46.49 2,048,247$46.49 
Summary of Restricted Shares of Stock and Unit Awards
A summary of the status of the Company’s restricted shares of stock and unit awards is presented below:
 202420232022
Year Ended December 31SharesWeighted-Average Grant-Date Fair ValueSharesWeighted-Average Grant-Date Fair ValueSharesWeighted-Average Grant-Date Fair Value
Outstanding at beginning of period8,316,571 $48.42 6,880,826 $52.59 6,812,753 $51.04 
Granted6,107,976 42.12 5,565,634 45.87 4,109,793 55.62 
Vested(4,680,480)48.52 (3,872,874)52.05 (3,690,666)52.88 
Cancelled(502,680)44.06 (257,015)50.00 (351,054)54.95 
Outstanding at end of period9,241,387 $44.45 8,316,571 $48.42 6,880,826 $52.59