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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2011
Fair Value of Financial Instruments [Abstract]  
Comparison of the fair values and carrying amounts of financial instrument
                                 
April 30,   2010     2011  
    Carrying     Fair     Carrying     Fair  
    Amount     Value     Amount     Value  
Assets:
                               
Cash and cash equivalents
  $ 232     $ 232     $ 567     $ 567  
Commodity derivatives
    —       —       5       5  
Currency derivatives
    6       6       —       —  
Interest rate swaps
    —       —       3       3  
 
                               
Liabilities:
                               
Currency derivatives
    6       6       25       25  
Short-term borrowings
    188       188       —       —  
Current portion of long-term debt
    3       3       255       265  
Long-term debt
    508       547       504       531