Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2013	May 31, 2012
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 289	$ 281
Liability Derivatives	34	55
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	231	225
Liability Derivatives	12	35
Designated as Hedging Instrument | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	141	203
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	79	7
Designated as Hedging Instrument | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	12	35
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	0
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	11	15
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	58	56
Liability Derivatives	22	20
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	58	55
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	22	20
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	1
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0	$ 0