Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Share-based Compensation, Activity [Table Text Block]

Stock-based compensation expense and the associated income tax benefit recognized during the three and nine months ended September 30, 2023 and 2022 were as follows:

	Three Months Ended September 30		Nine Months Ended September 30
($ in millions)	2023	2022	2023	2022
Stock-based compensation expense	$8	$9	$42	$27
Income tax benefit recognized	$2	$2	$9	$6

Details of Grants of Stock-based Compensation

Grants of stock-based compensation during the nine months ended September 30, 2023 and 2022 were as follows:

	Nine Months Ended September 30
	2023		2022
	Shares	Fair Value	Shares	Fair Value
Stock options	410,001	$38.55	487,277	$36.52
Restricted stock units	289,573	$125.79	223,729	$141.50
Contingent shares (a)	52,389	$129.03	57,134	$151.87

(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 nine months ended September 30, 2023 was calculated with the following weighted average assumptions:

Weighted average exercise price	$130.08
Risk-free interest rate	3.9	%
Expected life of option in years	6.5
Expected dividend yield	1.7	%
Expected volatility	27.8	%