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Fair Value of Financial Instruments (Tables)
12 Months Ended
Apr. 30, 2012
Fair Value of Financial Instruments [Abstract]  
Comparison of the fair values and carrying amounts of financial instrument
                                 
April 30,   2011     2012  
    Carrying
Amount
    Fair
Value
    Carrying
Amount
    Fair
Value
 

Assets:

                               

Cash and cash equivalents

  $ 567     $ 567     $ 338     $ 338  

Commodity derivatives

    5       5       —         —    

Currency derivatives

    —         —         1       1  

Interest rate swaps

    3       3       2       2  
         

Liabilities:

                               

Commodity derivatives

    —         —         1       1  

Currency derivatives

    25       25       7       7  

Short-term borrowings

    —         —         4       4  

Current portion of long-term debt

    255       265       3       3  

Long-term debt

    504       531       503       534