Fair Value of Derivative Instruments Included within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Feb. 29, 2012	May 31, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 157	$ 53
Liability Derivatives	75	197
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	131	44
Liability Derivatives	40	180
Designated as Hedging Instrument | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	93	22
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	22	7
Designated as Hedging Instrument | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	40	170
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other long-term liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	10
Designated as Hedging Instrument | Interest rate swap contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	1	0
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	15	15
Designated as Hedging Instrument | Interest rate swap contracts | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other long-term liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	26	9
Liability Derivatives	35	17
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	26	9
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	34	16
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other long-term liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1	$ 1