Identified Intangible Assets and Goodwill - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense, which is included in selling and administrative expense	$ 14	$ 14	$ 13
Estimated amortization expense for intangible assets subject to amortization, 2014	13
Estimated amortization expense for intangible assets subject to amortization, 2015	9
Estimated amortization expense for intangible assets subject to amortization, 2016	9
Estimated amortization expense for intangible assets subject to amortization, 2017	7
Estimated amortization expense for intangible assets subject to amortization, 2018	6
Goodwill	$ 131	$ 131