Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Assets, Fair Value Disclosure [Abstract]
Cash	$ 774	$ 615
Assets at Fair Value	5,467	5,932
Cash Equivalents	3,138	3,852
Short-term Investments	2,319	2,072
Other Long-term Assets	10	8
Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
Assets at Fair Value	1,265	869
Cash Equivalents	100	225
Short-term Investments	1,165	644
Other Long-term Assets	0	0
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Assets at Fair Value	3,418	4,440
Cash Equivalents	2,264	3,012
Short-term Investments	1,154	1,428
Other Long-term Assets	0	0
Fair Value, Inputs, Level 2 | Time deposits
Assets, Fair Value Disclosure [Abstract]
Assets at Fair Value	831	684
Cash Equivalents	827	684
Short-term Investments	4	0
Other Long-term Assets	0	0
Fair Value, Inputs, Level 2 | U.S. Agency securities
Assets, Fair Value Disclosure [Abstract]
Assets at Fair Value	679	976
Cash Equivalents	0	110
Short-term Investments	679	866
Other Long-term Assets	0	0
Fair Value, Inputs, Level 2 | Commercial paper and bonds
Assets, Fair Value Disclosure [Abstract]
Assets at Fair Value	733	914
Cash Equivalents	262	352
Short-term Investments	471	562
Other Long-term Assets	0	0
Fair Value, Inputs, Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
Assets at Fair Value	1,175	1,866
Cash Equivalents	1,175	1,866
Short-term Investments	0	0
Other Long-term Assets	0	0
Fair Value, Inputs, Level 3 | Non-marketable preferred stock
Assets, Fair Value Disclosure [Abstract]
Assets at Fair Value	10	8
Cash Equivalents	0	0
Short-term Investments	0	0
Other Long-term Assets	$ 10	$ 8