Comprehensive Income, Net of Taxes (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Comprehensive Income (Loss) [Line Items]
Changes in cumulative translation adjustment and other, tax benefit (expense)	$ (37)	$ (38)	$ 29	$ (89)
Net (loss) gains on hedge derivatives, tax benefit (expense)	3	27	(7)	65
Reclassification to net income of previously deferred losses (gains) related to hedge derivative instruments, tax (benefit) expense	0	2	(12)	28
Net (loss) gains on net investment hedge derivatives, tax benefit (expense)	$ 0	$ 11	$ (12)	$ 19

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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