v2.4.0.6
Identified Intangible Assets and Goodwill - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
May 31, 2012
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense, which is included in selling and administrative expense $ 3 $ 4 $ 7 $ 7  
Estimated amortization expense for intangible assets subject to amortization, remainder of 2013 6   6    
Estimated amortization expense for intangible assets subject to amortization, 2014 9   9    
Estimated amortization expense for intangible assets subject to amortization, 2015 6   6    
Estimated amortization expense for intangible assets subject to amortization, 2016 5   5    
Estimated amortization expense for intangible assets subject to amortization, 2017 4   4    
Goodwill $ 131   $ 131   $ 131