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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) |

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- Definition Derivative, Assets And Liabilities, Net, Collateral, Right to Reclaim Securities + References No definition available. + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 + Details
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