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Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Deferred income taxes and other long-term liabilities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Deferred compensation plan liabilities | $ 641 | $ 569 |
Liability related to the unfunded pension plan | 70 | 107 |
General and Administrative Expense |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
401(k) employee savings plans, expenses | 80 | 75 | $ 72
General and Administrative Expense | Profit Sharing Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Contribution and cash award expenses included in selling and administrative expenses | 59 | 68 | 64
General and Administrative Expense | Long Term Incentive Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Contribution and cash award expenses included in selling and administrative expenses | $ 33 | $ 21 | $ 85

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