Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2014	May 31, 2013
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 133	$ 289
Liability Derivatives	85	34
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	108	231
Liability Derivatives	58	12
Designated as Hedging Instrument | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	76	141
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	26	79
Designated as Hedging Instrument | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	57	12
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	1	0
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	6	11
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	25	58
Liability Derivatives	27	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	25	58
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 27	$ 22