Fair Value of Derivative Instruments Included within the Consolidated Balance Sheet (Detail) (USD $) In Millions	Aug. 31, 2011	May 31, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 63	$ 53
Liability Derivatives	186	197
Foreign exchange forwards and options | Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	33	22
Foreign exchange forwards and options | Designated as Hedging Instrument | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	1	7
Foreign exchange forwards and options | Designated as Hedging Instrument | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	153	170
Foreign exchange forwards and options | Designated as Hedging Instrument | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2	10
Interest rate swap contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	0
Interest rate swap contracts | Designated as Hedging Instrument | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	16	15
Interest rate swap contracts | Designated as Hedging Instrument | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Interest rate swap contracts | Designated as Hedging Instrument | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	52	44
Liability Derivatives	155	180
Foreign exchange forwards and options | Derivatives not designated as hedging instruments | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	11	9
Foreign exchange forwards and options | Derivatives not designated as hedging instruments | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Foreign exchange forwards and options | Derivatives not designated as hedging instruments | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	27	16
Foreign exchange forwards and options | Derivatives not designated as hedging instruments | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	4	1
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	11	9
Liability Derivatives	$ 31	$ 17