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Derivatives and Currency Exchange Risk Management , Freestanding Derivative Forward Contracts and Cash Flow Hedges (Details) - USD ($) | 12 Months Ended
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Apr. 28, 2017 | Apr. 29, 2016 | Apr. 24, 2015
Derivative Instruments |  |  |
Gains (losses) relating to ineffectiveness of cash flow hedges | $ 0 | $ 0 | $ 0
Gains (losses) relating to ineffectiveness of forward starting interest rate derivative instruments | 0 | 0 | 0
After-tax net unrealized gains (losses) | 37,000,000 | (90,000,000) |
Cash flow hedge unrealized gains to be reclassified over the next twelve months, net of tax | 73,000,000 |  |
Currency exchange rate contracts |  |  |
Derivative Instruments |  |  |
Gross notional amount | 10,800,000,000 | 10,800,000,000 |
Interest rate swaps |  |  |
Derivative Instruments |  |  |
Recognized in AOCI | $ 363,000,000 | (164,000,000) |
Weighted average fixed rate of interest rate derivatives | 3.10% |  |
Market value of derivative instruments - unrealized (loss) gain | $ 0 | (48,000,000) |
Other expense, net | Currency exchange rate contracts |  |  |
Derivative Instruments |  |  |
Currency exchange rate contracts | 54,000,000 | 33,000,000 | 210,000,000
Cash flow hedges |  |  |
Derivative Instruments |  |  |
Recognized in AOCI | 342,000,000 | (165,000,000) | 707,000,000
Recognized in Income | 173,000,000 | 368,000,000 | 156,000,000
Cash flow hedges | Currency exchange rate contracts |  |  |
Derivative Instruments |  |  |
Recognized in AOCI | 342,000,000 | (165,000,000) | 707,000,000
Cash flow hedges | Other expense, net | Currency exchange rate contracts |  |  |
Derivative Instruments |  |  |
Recognized in Income | 173,000,000 | 405,000,000 | 221,000,000
Cash flow hedges | Cost of products sold | Currency exchange rate contracts |  |  |
Derivative Instruments |  |  |
Recognized in Income |  | (37,000,000) | $ (65,000,000)
Derivatives not designated as hedging instruments | Currency exchange rate contracts |  |  |
Derivative Instruments |  |  |
Gross notional amount | 4,900,000,000 | 5,000,000,000 |
Derivatives designated as hedging instruments | Cash flow hedges | Currency exchange rate contracts |  |  |
Derivative Instruments |  |  |
Gross notional amount | $ 5,800,000,000 | $ 5,700,000,000 |
Derivative term | 3 years | 3 years |
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate swaps |  |  |
Derivative Instruments |  |  |
Gross notional amount |  | $ 300,000,000 |
Payments for hedge upon termination | $ 27,000,000 | 45,000,000 |
Derivative, notional amount terminated |  | $ 500,000,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Notional amount of derivative(s) terminated. Expressed as an absolute value. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss), net of tax as of the balance sheet date, related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in foreign currency cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3581-108585 + Details
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