Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015	Aug. 31, 2016	May 31, 2014
Income Tax Contingency [Line Items]
Effective tax rate, change from prior period	(5.50%)	(3.50%)
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 461,000,000	$ 506,000,000	$ 438,000,000		$ 506,000,000
Total gross unrecognized tax benefits, excluding related interest and penalties, amount which would affect the Company's effective tax rate if recognized in future periods	230,000,000
Increase (decrease) in liability for payment of interest and penalties	(38,000,000)	45,000,000	(3,000,000)
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	171,000,000	209,000,000
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	69,000,000
Reinvestment of the cumulative undistributed earnings of certain foreign subsidiaries	12,200,000,000
Unrecognized deferred tax liability associated with the indefinitely reinvested undistributed earnings	$ 4,100,000,000
Tax holiday, expiration period	2021
Decrease in income tax expense related to tax holiday	$ 187,000,000	$ 173,000,000	$ 174,000,000
Decrease in income tax expense related to tax holiday per diluted share, (in dollars per share)	$ 0.11	$ 0.10	$ 0.10
Valuation allowance increase (decrease) related to tax benefits of certain subsidiaries with operating losses	$ 30,000,000	$ 43,000,000	$ 0
Available domestic and foreign loss carry-forwards	266,000,000
Foreign tax credit carry-forwards	208,000,000	0
Income tax benefits attributable to employee stock-based compensation	$ 177,000,000	281,000,000	$ 224,000,000
Tax Year 2012 | Domestic Tax Authority
Income Tax Contingency [Line Items]
Proposed increase in tax related to the foreign tax credit matter		$ 254,000,000
Adjustment from settlement with taxing authority				$ 0