Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011	May 31, 2010
Income Taxes [Line Items]
Effective tax rate, change from prior period	(0.30%)	0.90%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 447,000,000	$ 285,000,000	$ 212,000,000	$ 282,000,000
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	281,000,000
Increase in liability for payment of interest and penalties	4,000,000	17,000,000	10,000,000
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	112,000,000	108,000,000
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	86,000,000
Reinvestment of the cumulative undistributed earnings of certain foreign subsidiaries	6,700,000,000
Unrecognized deferred tax liability associated with the indefinitely reinvested undistributed earnings	2,200,000,000
Tax holiday, expiration period (year)	2019
Decrease in income tax expense related to tax holiday	108,000,000	117,000,000	36,000,000
Decrease in income tax expense related to tax holiday per diluted share, (in dollars per share)	$ 0.12	$ 0.12	$ 0.04
Valuation allowance related to tax benefits of certain subsidiaries with operating losses	22,000,000	23,000,000	1,000,000
Deferred tax assets for foreign tax credit carry-forwards	106,000,000	216,000,000
Available domestic and foreign loss carry-forwards	58,000,000
Income tax benefits attributable to employee stock-based compensation	$ 76,000,000	$ 120,000,000	$ 68,000,000