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Derivatives and Currency Exchange Risk Management - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Jul. 28, 2017
Apr. 28, 2017
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recorded Assets (Liabilities) $ 159 $ 262
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments (135) (75)
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 (60)
Derivative Assets, Net Amount 24 127
Derivative Liabilities, Gross Amount of Recorded Assets (Liabilities) (278) (104)
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 135 75
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 0
Derivative Liabilities, Net Amount (143) (29)
Gross Amount of Recorded Assets (Liabilities) (119) 158
Gross Amount Not Offset on the Balance Sheet, Financial Instruments 0 0
Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 (60)
Net Amount (119) 98
Currency exchange rate contracts    
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recorded Assets (Liabilities) 107 216
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments (106) (58)
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 (55)
Derivative Assets, Net Amount 1 103
Derivative Liabilities, Gross Amount of Recorded Assets (Liabilities) (268) (93)
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 133 73
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 0
Derivative Liabilities, Net Amount (135) (20)
Interest rate contracts    
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recorded Assets (Liabilities) 41 41
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments (27) (15)
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 (5)
Derivative Assets, Net Amount 14 21
Cross currency interest rate contracts    
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recorded Assets (Liabilities) 5 5
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Financial Instruments (2) (2)
Derivative Assets, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 0
Derivative Assets, Net Amount 3 3
Derivative Liabilities, Gross Amount of Recorded Assets (Liabilities) (10) (11)
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Financial Instruments 2 2
Derivative Liabilities, Gross Amount Not Offset on the Balance Sheet, Collateral (Received) or Posted 0 0
Derivative Liabilities, Net Amount (8) $ (9)
Total return swap    
Offsetting Assets and Liabilities [Line Items]    
Derivative Assets, Gross Amount of Recorded Assets (Liabilities) 6  
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 $ 6