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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Share-based Compensation, Activity [Table Text Block]

Stock-based compensation and the income tax benefit recognized during the three and nine months ended September 30, 2021 and 2020 were as follows:

			Three Months Ended September 30												Nine Months Ended September 30
($ in millions)			2021						2020						2021						2020
Stock-based compensation			$4						$14						$39						$29
Income tax benefit recognized			$1						$3						$9						$7

Details of Grants of Stock-based Compensation

Grants of stock-based compensation during the nine months ended September 30, 2021 and 2020 were as follows:

			Nine Months Ended September 30
			2021												2020
Grant Details			Shares						Fair Value						Shares						Fair Value
Stock options			527,464						$29.27						663,485						$21.93
Restricted stock units			201,068						$134.54						203,574						$109.99
Contingent shares (a)			55,540						$136.60						55,319						$119.52

(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 nine months ended September 30, 2021 was calculated with the following weighted average assumptions:

Weighted average exercise price			$136.60
Risk free interest rate			1.0		%
Expected life of option in years			6.5
Expected dividend yield			1.6		%
Expected volatility			25.3		%

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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