Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Feb. 28, 2014	May 31, 2013
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 128	$ 289
Liability Derivatives	117	34
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	106	231
Liability Derivatives	88	12
Designated as Hedging Instrument | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	79	141
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	20	79
Designated as Hedging Instrument | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	82	12
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other long-term liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	6	0
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	7	11
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	22	58
Liability Derivatives	29	22
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	58
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	28	22
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	1	0
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1	$ 0