Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2013 Prior Year Revision [Member]	May 31, 2013 Prior Year Revision [Member]
Significant Accounting Policies [Line Items]
Inventories				$ 96
Increase (Decrease) in Inventories	343	105	36
Cash provided by operations	1,683	1,692	24
Increase in accrued liabilities				(96)
Cash flow impact from inventory related adjustment			36
Increase in cash provided by operations	$ 1,246	$ (286)	$ 24