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	May 31, 2014	May 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	$ 780	$ 663
Assets at Fair Value	5,149	5,970
Cash and Cash Equivalents	2,220	3,337
Short-term Investments	2,922	2,628
Other Long-term Assets	7	5
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	1,137	2,008
Cash and Cash Equivalents	151	425
Short-term Investments	986	1,583
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	3,225	3,294
Cash and Cash Equivalents	1,289	2,249
Short-term Investments	1,936	1,045
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	227	358
Cash and Cash Equivalents	227	358
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	1,027	1,026	[1]
Cash and Cash Equivalents	25	395	[1]
Short-term Investments	1,002	631	[1]
Other Long-term Assets	0	0	[1]
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	959	1,074	[1]
Cash and Cash Equivalents	25	660	[1]
Short-term Investments	934	414	[1]
Other Long-term Assets	0	0	[1]
Fair Value Measurements Using Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	1,012	836
Cash and Cash Equivalents	1,012	836
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	5
Other Long-term Assets	$ 7	$ 5

[1] Amounts have been revised to reflect proper classification between U.S. Agency securities and commercial paper and bonds.