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Common Stock and Stock-Based Compensation (Tables) | 12 Months Ended
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May 31, 2018
Share-based Compensation [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | The following table summarizes the Company’s total stock-based compensation expense recognized in Cost of sales or Operating overhead expense, as applicable:
|  | Year Ended May 31,
(In millions) |  | 2018 |  | 2017 |  | 2016
Stock options(1) |  | $ | 149 |  |  | $ | 145 |  |  | $ | 171 |
ESPPs |  | 34 |  |  | 36 |  |  | 31 |
Restricted stock |  | 35 |  |  | 34 |  |  | 34 |
TOTAL STOCK-BASED COMPENSATION EXPENSE |  | $ | 218 |  |  | $ | 215 |  |  | $ | 236 |
(1) | Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option expense is recorded for employees eligible for accelerated stock option vesting upon retirement. Accelerated stock option expense was $18 million, $14 million and $30 million for the years ended May 31, 2018, 2017 and 2016, respectively.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted average assumptions used to estimate these fair values are as follows:
|  | Year Ended May 31,
|  | 2018 |  | 2017 |  | 2016
Dividend yield |  | 1.2 | % |  | 1.1 | % |  | 1.0 | %
Expected volatility |  | 16.4 | % |  | 17.4 | % |  | 23.6 | %
Weighted average expected life (in years) |  | 6.0 |  |  | 6.0 |  |  | 5.8 |
Risk-free interest rate |  | 2.0 | % |  | 1.3 | % |  | 1.7 | %
Schedule of Share-based Compensation, Stock Options, Activity | The following summarizes the stock option transactions under the plan discussed above:
|  | Shares(1) |  | Weighted Average Option Price
|  | (In millions) |  |
Options outstanding May 31, 2015 |  | 116.2 |  |  | $ | 23.50 |
Exercised |  | (22.5 | ) |  | 17.75 |
Forfeited |  | (2.3 | ) |  | 39.96 |
Granted |  | 20.6 |  |  | 56.41 |
Options outstanding May 31, 2016 |  | 112.0 |  |  | 30.38 |
Exercised |  | (17.1 | ) |  | 20.42 |
Forfeited |  | (2.3 | ) |  | 49.47 |
Granted |  | 12.2 |  |  | 57.81 |
Options outstanding May 31, 2017 |  | 104.8 |  |  | 34.79 |
Exercised |  | (24.1 | ) |  | 25.07 |
Forfeited |  | (4.3 | ) |  | 55.31 |
Granted |  | 16.8 |  |  | 59.08 |
Options outstanding May 31, 2018 |  | 93.2 |  |  | $ | 40.73 |
Options exercisable at May 31, |  |  |  |
2016 |  | 66.5 |  |  | $ | 21.48 |
2017 |  | 67.9 |  |  | 26.03 |
2018 |  | 58.5 |  |  | 31.60 |
(1) | Includes stock appreciation rights transactions.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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