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Derivatives and Currency Exchange Risk Management - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Jul. 28, 2017 | Jul. 29, 2016 | Apr. 28, 2017 | Jan. 27, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gains (losses) relating to ineffectiveness of cash flow hedges | $ 0 | $ 0 |  |
Gains (losses) relating to ineffectiveness of forward starting interest rate derivatives |  | 0 |  |
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI | (134,000,000) |  | $ 37,000,000 |
Cash flow hedge unrealized losses to be reclassified over the next 12 months | 37,000,000 |  |  |
Debt, face amount | 28,900,000,000 |  | 28,900,000,000 |
Gains (losses) relating to ineffectiveness of interest rate fair value hedges | 0 | 0 |  |
Gains (losses) on firm commitments that no longer qualify as fair value hedges | 0 | 0 |  |
Cash flow hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gains (losses) recognized in AOCI | (250,000,000) | 121,000,000 |  |
Effective portion of net gains (losses) on derivative instruments reclassified from accumulated other comprehensive loss | 22,000,000 | 15,000,000 |  |
Currency exchange rate contracts |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount | 11,800,000,000 |  | 10,800,000,000 |
Currency exchange rate contracts | Cash flow hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gains (losses) recognized in AOCI | (250,000,000) | 121,000,000 |  |
Currency exchange rate contracts | Derivatives not designated as hedging instruments |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount | 5,400,000,000 |  | 4,900,000,000 |
Currency exchange rate contracts | Derivatives designated as hedging instruments | Cash flow hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount | $ 6,300,000,000 |  | 5,800,000,000 |
Maximum remaining maturity of foreign currency derivatives | 3 years |  |  |
Interest rate swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gains (losses) recognized in AOCI |  | (23,000,000) |  |
Interest rate swaps | Cash flow hedging | Interest expense, net |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Effective portion of net gains (losses) on derivative instruments reclassified from accumulated other comprehensive loss | $ 0 | $ 0 |  |
Interest rate swaps | Derivatives designated as hedging instruments | Cash flow hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount |  |  |  | $ 300,000,000
Average interest rate |  |  |  | 3.10%
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount | 1,200,000,000 |  | 1,200,000,000 |
Market value of outstanding interest rate swap agreements - net unrealized gain | 41,000,000 |  | 41,000,000 |
Market value of hedged item - net unrealized loss | $ 41,000,000 |  | 41,000,000 |
4.125 percent ten-year 2011 senior notes | Senior notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Stated interest rate | 4.125% |  |  |
4.125 percent ten-year 2011 senior notes | Senior notes | Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Debt, face amount | $ 500,000,000 |  | $ 500,000,000 |
Stated interest rate | 4.125% |  | 4.125% |
3.125 percent ten-year 2012 senior notes | Senior notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Stated interest rate | 3.125% |  |  |
3.125 percent ten-year 2012 senior notes | Senior notes | Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Debt, face amount | $ 675,000,000 |  | $ 675,000,000 |
Stated interest rate | 3.125% |  | 3.125% |

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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 Market value related to the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 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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