Income Taxes - Reconciliation of Changes in Gross Balance of Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014		May 31, 2013		May 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, as of the beginning of the period	$ 447		$ 285		$ 212
Gross increases related to prior period tax positions	814	[1]	77	[1]	48	[1]
Gross decreases related to prior period tax positions	(166)	[1]	(3)	[1]	(25)	[1]
Gross increases related to current period tax positions	125		130		91
Gross decreases related to current period tax positions	(30)		(9)		(1)
Settlements	(676)	[1]	0	[1]	(20)	[1]
Lapse of statute of limitations	(4)		(21)		(9)
Changes due to currency translation	(4)		(12)		(11)
UNRECOGNIZED TAX BENEFITS, AS OF THE END OF THE PERIOD	$ 506		$ 447		$ 285

[1] During the fourth quarter of the fiscal year ended May 31, 2014, the Company reached a resolution with the IRS on a U.S. Unilateral Advanced Pricing Agreement that covers intercompany transfer pricing for fiscal years 2011 through 2020. As a result, the Company recorded a gross increase in unrecognized tax benefits related to prior period tax positions, a gross decrease in unrecognized tax benefits related to prior period tax positions, and a settlement. The net impact of these items resulted in a decrease to unrecognized tax benefits.