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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Share-based Compensation, Activity [Table Text Block] |
| Three Months Ended March 31 |  |
($ in millions) | 2024 |  | 2023 |  |  |  |
Stock-based compensation expense | $12 |  |  | $17 |  |  |  |  |
Income tax benefit recognized | $2 |  |  | $4 |  |  |  |  |
Details of Grants of Stock-based Compensation | Grants of stock-based compensation during the three months ended March 31, 2024 and 2023 were as follows:
| Three Months Ended March 31
| 2024 |  | 2023
| Shares |  | Fair Value |  | Shares |  | Fair Value
Stock options | 426,939 |  |  | $43.83 |  |  | 410,001 |  |  | $38.55 |
Restricted stock units | 207,370 |  |  | $137.83 |  |  | 248,949 |  |  | $124.44 |
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 three months ended March 31, 2024 was calculated with the following weighted average assumptions:
Weighted average exercise price | $142.65
Risk-free interest rate | 4.3 | %
Expected life of option in years | 6.5
Expected dividend yield | 1.7 | %
Expected volatility | 28.4 | %

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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