Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Millions, unless otherwise specified	Aug. 31, 2014	May 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	$ 976	$ 780
Assets at Fair Value	4,586	5,149
Cash and Cash Equivalents	2,303	2,220
Short-term Investments	2,276	2,922
Other Long-term Assets	7	7
Fair Value Measurements Using Level 1 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	985	1,137
Cash and Cash Equivalents	150	151
Short-term Investments	835	986
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	283	133
Assets at Fair Value	2,618	3,225
Cash and Cash Equivalents	1,177	1,289
Short-term Investments	1,441	1,936
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | Time deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	244	227
Cash and Cash Equivalents	244	227
Short-term Investments	0	0
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | U.S. Agency securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	785	1,027
Cash and Cash Equivalents	48	25
Short-term Investments	737	1,002
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | Commercial paper and bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	779	959
Cash and Cash Equivalents	75	25
Short-term Investments	704	934
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	810	1,012
Cash and Cash Equivalents	810	1,012
Short-term Investments	0	0
Other Long-term Assets	0	0
Fair Value Measurements Using Level 3 | Non-marketable preferred stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	7	7
Cash and Cash Equivalents	0	0
Short-term Investments	0	0
Other Long-term Assets	$ 7	$ 7