Fair Value of Derivative Instruments Included within the Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2011	May 31, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 207	$ 53
Liability Derivatives	47	197
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	186	44
Liability Derivatives	32	180
Designated as Hedging Instrument | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	144	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	26	7
Designated as Hedging Instrument | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	32	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	21	9
Liability Derivatives	15	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	21	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	13	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	$ 2	$ 1