v2.4.0.6
SCHEDULE II - Valuation and Qualifying Accounts (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 124 $ 117 $ 111
Charged to Costs and Expenses 24 25 46
Charged to Other Accounts (10) 15 (10)
Write-Offs Net of Recoveries (43) (33) (30)
Balance at End of Period $ 95 $ 124 $ 117