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Stock-based Compensation (Tables) | 12 Months Ended
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Jan. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of option valuation assumptions | The per share weighted average fair value of stock options granted and the assumptions used in determining fair value at the date of grant using the Black-Scholes option-pricing model follow:
| Fiscal |  | Fiscal |  | Fiscal
| 2020 |  | 2019 |  | 2018
Per share weighted average fair value | $ | 36.77 |  |  | $ | 27.33 |  |  | $ | 32.28 |
Risk-free interest rate | 0.6 | % |  | 2.2 | % |  | 2.7 | %
Assumed volatility | 29.9 | % |  | 19.8 | % |  | 21.3 | %
Assumed dividend yield | 3.1 | % |  | 2.9 | % |  | 2.3 | %
Assumed lives of options | 6 years |  | 5 years |  | 5 years
Intrinsic value of stock options exercised | The total intrinsic value of stock options exercised follows:
in millions | Fiscal |  | Fiscal |  | Fiscal
2020 |  | 2019 |  | 2018
Total intrinsic value of stock options exercised | $ | 217 |  |  | $ | 241 |  |  | $ | 138 |
Summary of option activity by number of shares and weighted average exercise price | A summary of stock option activity by number of shares and weighted average exercise price during fiscal 2020 follows:
shares in thousands | Number of Shares |  | Weighted Average Exercise Price
Outstanding at beginning of year | 5,212 |  |  | $ | 111.54 |
Granted | 422 |  |  | 193.84 |
Exercised | (1,258) |  |  | 75.83 |
Forfeited | (26) |  |  | 169.40 |
Outstanding at end of year | 4,350 |  |  | 129.50 |
Summary of options outstanding and exercisable | Details regarding outstanding and exercisable stock options at January 31, 2021 follow:
shares in thousands, dollars in millions, except for per share amounts | Number of Shares |  | Intrinsic Value |  | Weighted Average Remaining Life |  | Weighted Average Exercise Price
Outstanding | 4,350 |  |  | $ | 615 |  |  | 5 years |  | $ | 129.50 |
Exercisable | 2,677 |  |  | 454 |  |  | 4 years |  | 101.08 |
Schedule of deferred shares granted | Deferred shares granted to non-employee directors follow:
| Fiscal |  | Fiscal |  | Fiscal
2020 |  | 2019 |  | 2018
Deferred shares granted to non-employee directors | 18,000 |  |  | 22,000 |  |  | 26,000 |
Summary of restricted stock, performance shares, and restricted stock unit activity | A summary of restricted stock, performance shares, and restricted stock unit activity during fiscal 2020 follows:
shares in thousands | Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested at beginning of year | 3,975 |  |  | $ | 170.58 |
Granted | 1,803 |  |  | 181.75 |
Vested | (1,506) |  |  | 155.14 |
Forfeited | (174) |  |  | 177.71 |
Nonvested at end of year | 4,098 |  |  | 180.87 |
Schedule of stock-based compensation expense, net of estimated forfeitures | Stock-based compensation expense, net of estimated forfeitures and related income tax benefit follows:
in millions | Fiscal |  | Fiscal |  | Fiscal
2020 |  | 2019 |  | 2018
Pre-tax stock-based compensation expense | $ | 310 |  |  | $ | 251 |  |  | $ | 282 |
Income tax benefit | (58) |  |  | (49) |  |  | (49) |
After-tax stock-based compensation expense | $ | 252 |  |  | $ | 202 |  |  | $ | 233 |
Total fair value of restricted stock, performance shares, and restricted stock units that vested | The total fair value of restricted stock, performance shares, and restricted stock units that vested during the fiscal year follow:
in millions | Fiscal |  | Fiscal |  | Fiscal
2020 |  | 2019 |  | 2018
Total fair value vested | $ | 271 |  |  | $ | 303 |  |  | $ | 367 |

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- Definition Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability. + 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 -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 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20517-108367 + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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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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