Identified Intangible Assets and Goodwill - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Increase in unamortized intangible assets due to the effect of foreign exchange fluctuations	$ 1
Increase in goodwill due to the effect of foreign exchange fluctuations	1
Amortization expense, which is included in selling and administrative expense	5	5
Estimated amortization expense for intangible assets subject to amortization, remainder of 2013	16
Estimated amortization expense for intangible assets subject to amortization, 2014	19
Estimated amortization expense for intangible assets subject to amortization, 2015	16
Estimated amortization expense for intangible assets subject to amortization, 2016	15
Estimated amortization expense for intangible assets subject to amortization, 2017	$ 14