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Derivatives and Foreign Exchange Risk Management - Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring [Member] - USD ($)
$ in Millions
Oct. 30, 2015
Apr. 24, 2015
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets $ 403 $ 644
Derivative Liabilities 47 45
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 95 89
Derivative Liabilities 85 71
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities $ 0 $ 0