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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 19, 2015 | May 31, 2016 USD ($) | May 31, 2015 USD ($) | May 31, 2014 USD ($) | Dec. 23, 2015
Significant Accounting Policies [Line Items] |  |  |  |  |
Stock split ratio for 100 percent of stock dividend declared | 2 |  |  |  |
Dividend payable as result of stock split (as a percent) |  |  |  |  | 100.00%
Reserve balances for sales discounts, returns and miscellaneous claims |  | $ 789 | $ 724 |  |
Total advertising and promotion expenses |  | 3,278 | 3,213 | $ 3,031 |
Prepaid advertising and promotion expenses |  | 540 | 455 |  |
Allowance for uncollectible accounts receivable |  | 43 | 78 |  |
Increase in non-current assets |  | $ 2,439 | 2,587 |  |
Minimum | Building |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 2 years |  |  |
Minimum | Leasehold improvements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 2 years |  |  |
Minimum | Machinery and Equipment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 2 years |  |  |
Minimum | Software and Software Development Costs |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 2 years |  |  |
Maximum | Building |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 40 years |  |  |
Maximum | Leasehold improvements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 40 years |  |  |
Maximum | Machinery and Equipment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 15 years |  |  |
Maximum | Software and Software Development Costs |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, minimum useful life (in years) |  | 10 years |  |  |
Class B Common Stock |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Stock split ratio for 100 percent of stock dividend declared | 2 |  |  |  |
Class A Convertible Common Stock |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Stock split ratio for 100 percent of stock dividend declared | 2 |  |  |  |
Other Noncurrent Assets |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Allowance for uncollectible accounts receivable |  | $ 17 | 24 |  |
New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Reduction in current assets |  |  | 389 |  |
Increase in non-current assets |  |  | 386 |  |
Reduction of current liabilities |  |  | 2 |  |
Reduction of non-current liabilities |  |  | $ 1 |  |

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