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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation, Activity [Table Text Block]
Three Months Ended
June 30		Six Months Ended
June 30
($ in millions)2024202320242023
Stock-based compensation expense$10 $17 $22 $34 
Income tax benefit recognized$2 $3 $4 $7 
Details of Grants of Stock-based Compensation
Grants of stock-based compensation during the six months ended June 30, 2024 and 2023 were as follows:
Six Months Ended
June 30
20242023
SharesFair ValueSharesFair Value
Stock options426,939 $43.83 410,001 $38.55 
Restricted stock units235,633 $135.49 276,897 $125.49 
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 six months ended June 30, 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 %