Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2023 and 2022 were as follows:

	Three Months Ended June 30		Six Months Ended June 30
($ in millions)	2023	2022	2023	2022
Stock-based compensation expense	$17	$12	$34	$18
Income tax benefit recognized	$3	$3	$7	$4

Details of Grants of Stock-based Compensation

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

	Six Months Ended June 30
	2023		2022
	Shares	Fair Value	Shares	Fair Value
Stock options	410,001	$38.55	487,277	$36.52
Restricted stock units	276,897	$125.49	211,914	$142.17
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 six months ended June 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	%