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Derivatives and Foreign Exchange Risk Management - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Oct. 30, 2015
Apr. 24, 2015
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recognized Assets (Liabilities) $ 498 $ 733
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments (74) (71)
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted (217) (338)
Derivative Assets, Net Amount 207 324
Derivative Liabilities, Gross Amount of Recognized Assets (Liabilities) (132) (116)
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 74 71
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 16 8
Derivative Liabilities, Net Amount (42) (37)
Gross Amount of Recognized Assets (Liabilities) 366 617
Gross Amount Not Offset on the Balance Sheet, Financial Instruments 0 0
Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted (201) (330)
Net Amount 165 287
Foreign currency exchange rate contracts [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recognized Assets (Liabilities) 403 644
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments (66) (61)
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted (205) (325)
Derivative Assets, Net Amount 132 258
Derivative Liabilities, Gross Amount of Recognized Assets (Liabilities) (47) (45)
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 39 31
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 0
Derivative Liabilities, Net Amount (8) (14)
Interest rate contracts [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recognized Assets (Liabilities) 74 89
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments (8) (10)
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted (12) (13)
Derivative Assets, Net Amount 54 66
Derivative Liabilities, Gross Amount of Recognized Assets (Liabilities) (72) (71)
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 35 40
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 16 8
Derivative Liabilities, Net Amount (21) $ (23)
Cross currency interest rate contracts [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recognized Assets (Liabilities) 21  
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 0  
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0  
Derivative Assets, Net Amount 21  
Derivative Liabilities, Gross Amount of Recognized Assets (Liabilities) (4)  
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 0  
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0  
Derivative Liabilities, Net Amount (4)  
Commodity derivatives [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative Liabilities, Gross Amount of Recognized Assets (Liabilities) (9)  
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 0  
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0  
Derivative Liabilities, Net Amount $ (9)