Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Nov. 30, 2015	May. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	$ 731	$ 615
Assets at Fair Value	6,133	5,932
Cash and Equivalents	3,851	3,852
Short-term Investments	2,265	2,072
Other Long-term Assets	17	8
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	1,283	869
Cash and Equivalents	233	225
Short-term Investments	1,050	644
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	4,102	4,440
Cash and Equivalents	2,887	3,012
Short-term Investments	1,215	1,428
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	734	684
Cash and Equivalents	734	684
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	1,015	976
Cash and Equivalents	250	110
Short-term Investments	765	866
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	781	914
Cash and Equivalents	331	352
Short-term Investments	450	562
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	1,572	1,866
Cash and Equivalents	1,572	1,866
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	17	8
Cash and Equivalents	0	0
Short-term Investments	0	0
Other Long-term Assets	$ 17	$ 8