Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

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 months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31
($ in millions)	2022	2021
Stock-based compensation expense	$6	$17
Income tax benefit recognized	$1	$4

Details of Grants of Stock-based Compensation

Grants of stock-based compensation during the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31
	2022		2021
Grant Details	Shares	Fair Value	Shares	Fair Value
Stock options	487,277	$36.52	527,464	$29.27
Restricted stock units	189,411	$143.92	162,601	$129.64
Contingent shares (a)	57,134	$151.87	55,540	$136.60

(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 option grants issued during the three months ended March 31, 2022 was calculated with the following weighted average assumptions:

Weighted average exercise price	$151.87
Risk free interest rate	2.0	%
Expected life of option in years	6.5
Expected dividend yield	1.6	%
Expected volatility	25.7	%