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Fair Value Measurements (Estimated Fair Value Of Company Long Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 28, 2012
Apr. 30, 2011
Notional Amount
   
Long-term debt $ 6,399 $ 6,081
Carrying Amount
   
Long-term debt 6,609 6,314
Fair Value
   
Long-term debt $ 7,312 $ 6,416