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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation, Activity [Table Text Block]
Three Months Ended
March 31
($ in millions)20252024
Stock-based compensation expense$23 $11 
Income tax benefit recognized$5 $2 
Details of Grants of Stock-based Compensation
Grants of stock-based compensation during the three months ended March 31, 2025 and 2024 were as follows:
Three Months Ended
March 31
20252024
SharesFair ValueSharesFair Value
Stock options541,313 $32.93 426,939 $43.83 
Restricted stock units254,278 $111.50 207,370 $137.83 
Contingent shares (a)
76,925 $114.39 51,543 $142.65 
(a)The number of contingent shares represents the target value of the award.
Weighted Average Assumptions Used in Calculating the Fair Value of Stock Option The fair value of the stock options granted during the three months ended March 31, 2025 was calculated with the following weighted average assumptions:
Weighted average exercise price$114.39
Risk-free interest rate4.2 %
Expected life of option in years5.5
Expected dividend yield1.8 %
Expected volatility29.4 %