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Stock-Based Compensation (Tables) | 9 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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