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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
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 six months ended June 30, 2020 and 2019 were as follows:
| Three Months Ended June 30 |  |  |  | Six Months Ended June 30 |  |
($ in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Stock-based compensation | $8 |  |  | $10 |  |  | $15 |  |  | $19 |
Income tax benefit recognized | $2 |  |  | $2 |  |  | $4 |  |  | $4 |
Details of Grants of Stock-based Compensation | Grants of stock-based compensation during the six months ended June 30, 2020 and 2019 were as follows:
| Six Months Ended June 30 |  |  |  |  |  |
| 2020 |  |  |  | 2019 |  |
Grant Details | Shares |  | Fair Value |  | Shares |  | Fair Value
Stock options | 663,485 |  |  | $21.93 |  |  | 588,870 |  |  | $22.50 |
Restricted stock units | 203,239 |  |  | $110.00 |  |  | 208,602 |  |  | $104.46 |
Contingent shares (a) | 55,319 |  |  | $119.52 |  |  | 51,850 |  |  | $109.74 |
(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 six months ended June 30, 2020 was calculated with the following weighted average assumptions:
Weighted average exercise price | $119.52
Risk free interest rate | 1.6 | %
Expected life of option in years | 6.5
Expected dividend yield | 1.5 | %
Expected volatility | 20.0 | %

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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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