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Stock Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-based Compensation Expense | Stock-based compensation expense for the following periods were:
In millions | Three months ended June 30 |  |  |  | Six months ended June 30 |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Restricted stock units | $ | 13 |  |  | $ | 22 |  |  | $ | 32 |  |  | $ | 42 |
Stock options | 6 |  | 2 |  |  | 10 |  |  | 4 |
Employee stock purchase plan | 1 |  | 1 |  |  | 3 |  |  | 2 |
Stock-based compensation expense | 20 |  | 25 |  | 45 |  | 48 |
Tax benefit | (2) |  |  | (4) |  |  | (5) |  |  | (7) |
Stock-based compensation expense (net of tax) | $ | 18 |  |  | $ | 21 |  |  | $ | 40 |  |  | $ | 41 |
Schedule of Valuation Assumptions Used To Estimate Fair Value of Stock Options | The table below details the assumptions used in determining the fair value of the option grants.
| Six months ended June 30 |  |
| 2020 |  | 2019
Dividend yield | $ | — |  |  | $ | — |
Risk-free interest rate | 1.44 | % |  | 2.50 | %
Expected volatility | 33.51 | % |  | 34.79 | %
Expected holding period (years) | 3.7 |  | 3.9

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(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 stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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