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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation, Activity [Table Text Block]
Three Months Ended
March 31
($ in millions)20242023
Stock-based compensation expense$12 $17 
Income tax benefit recognized$2 $4 
Details of Grants of Stock-based Compensation
Grants of stock-based compensation during the three months ended March 31, 2024 and 2023 were as follows:
Three Months Ended
March 31
20242023
SharesFair ValueSharesFair Value
Stock options426,939 $43.83 410,001 $38.55 
Restricted stock units207,370 $137.83 248,949 $124.44 
Contingent shares (a)
51,543 $142.65 52,389 $129.03 
(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, 2024 was calculated with the following weighted average assumptions:
Weighted average exercise price$142.65
Risk-free interest rate4.3 %
Expected life of option in years6.5
Expected dividend yield1.7 %
Expected volatility28.4 %