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Short-Term Borrowings (Details) (USD $)
9 Months Ended 11 Months Ended
Aug. 31, 2011
Nov. 30, 2010
Nov. 30, 2011
Aug. 26, 2011
Feb. 25, 2011
Extinguishment of Debt [Line Items]          
Revolving credit facility $ 950,000,000     $ 950,000,000 $ 1,000,000,000
Borrowings outstanding under the Credit Facility 0 0 0    
Short-Term Borrowings (Textuals) [Abstract]          
Outstanding unsecured or secured bank loans 353,000,000 0      
Average daily bank loans 16,000,000 23,800,000      
Short-term Debt [Member]
         
Extinguishment of Debt [Line Items]          
Revolving credit facility 1,000,000,000        
Borrowings outstanding under the Credit Facility $ 353,000,000