Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	May. 31, 2015	May. 31, 2014
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 1,639	$ 133
Liability Derivatives	175	85
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	1,423	108
Liability Derivatives	144	58
Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	825	76
Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	520	26
Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	140	57
Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	4	1
Designated as Hedging Instrument | Interest rate swaps | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	78	0
Designated as Hedging Instrument | Interest rate swaps | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	6
Designated as Hedging Instrument | Interest rate swaps | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Designated as Hedging Instrument | Interest rate swaps | 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	216	25
Liability Derivatives	31	27
Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	209	25
Derivatives not designated as hedging instruments | Foreign Exchange Contract [Member] | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	20	27
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	0
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	5	0
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2	0
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 9	$ 0