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Fair Value of Financial Instruments (Details) (USD $)
In Millions
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2009
Apr. 30, 2008
Assets:        
Cash and cash equivalents, Carrying Amount $ 567 $ 232 $ 340 $ 119
Cash and cash equivalents, Fair Value 567 232    
Liabilities:        
Short-term borrowings, Carrying Amount 0 188    
Short-term borrowings, Fair Value 0 188    
Current portion of long-term debt, Carrying Amount 255 3    
Current portion of long-term debt, Fair Value 265 3    
Long-term debt, less unamortized discount of $1 in 2010 and $2 in 2011 504 508    
Long Term Debt, Fair Value 531 547    
Commodity contracts [Member]
       
Assets:        
Contracts, Fair Value 5 0    
Contracts, Carrying Amount 5 0    
Foreign currency contracts [Member]
       
Assets:        
Contracts, Carrying Amount 0 6    
Liabilities:        
Commodity and Foreign currency contracts, Carrying Amount 25 6    
Interest Rate Swap [Member]
       
Assets:        
Contracts, Fair Value 3 0    
Contracts, Carrying Amount $ 3 $ 0