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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

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Fair value of securities received as collateral against derivative assets.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement and assets not subject to a master netting arrangement.

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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	May 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Collateral received from counterparties to hedging instruments	$ 769		$ 769		$ 0
Available-for-sale securities with maturity dates within one year from purchase date	1,727		1,727		2,287
Available-for-sale securities with maturity dates over one year and less than five years from purchase date	619		619		635
Investment Income, Interest	1us-gaap_InvestmentIncomeInterest	2us-gaap_InvestmentIncomeInterest	4us-gaap_InvestmentIncomeInterest	4us-gaap_InvestmentIncomeInterest
Fair value of long term debt	1,198us-gaap_LongTermDebtFairValue		1,198us-gaap_LongTermDebtFairValue		1,154us-gaap_LongTermDebtFairValue
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Collateral received from counterparties to hedging instruments	769		769
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Outstanding receivables	250		250
Foreign exchange forwards and options \| Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Collateral received from counterparties to hedging instruments	736		736
Interest rate swap \| Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Collateral received from counterparties to hedging instruments	$ 33		$ 33