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Derivatives and Currency Exchange Risk Management , Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Apr. 28, 2017
Apr. 29, 2016
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 216 $ 145
Derivative liabilities 93 166
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 46 103
Derivative liabilities $ 11 $ 53