v2.3.0.11
Accumulated Other Comprehensive Income (Loss) (Composition of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
3 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Balances - February 1, 2011 $ 646,000,000  
Currency translation adjustment 410,000,000  
Net change in fair value of derivatives (178,000,000) 83,000,000
Balances - April 30, 2011 878,000,000 (216,000,000)
Net translation gain (loss) related to net investment hedges (1,300,000,000)  
Currency Translation [Member]
   
Balances - February 1, 2011 1,226,000,000  
Currency translation adjustment 410,000,000  
Net change in fair value of derivatives    
Balances - April 30, 2011 1,636,000,000  
Derivative Instruments [Member]
   
Balances - February 1, 2011 60,000,000  
Currency translation adjustment    
Net change in fair value of derivatives (178,000,000)  
Balances - April 30, 2011 (118,000,000)  
Minimum Pension Liability [Member]
   
Balances - February 1, 2011 (640,000,000)  
Currency translation adjustment    
Net change in fair value of derivatives    
Balances - April 30, 2011 $ (640,000,000)