Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Aug. 31, 2014	May 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 283	$ 133
Derivative Liabilities	66	85
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	233	108
Derivative Liabilities	58	58
Designated as Hedging Instrument | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	169	76
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Derivative Assets	59	26
Designated as Hedging Instrument | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	53	57
Designated as Hedging Instrument | Foreign exchange forwards and options | Deferred income taxes and other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	5	1
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other long-term assets
Derivatives, Fair Value [Line Items]
Derivative Assets	5	6
Designated as Hedging Instrument | Interest rate swap contracts | Deferred income taxes and other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	50	25
Derivative Liabilities	8	27
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	50	25
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	7	27
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 1	$ 0