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Derivatives and Foreign Exchange Risk Management - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 30, 2015 | Oct. 24, 2014 | Oct. 30, 2015 | Oct. 24, 2014 | Apr. 24, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Currency exchange rate gains (losses) | $ 55,000,000 | $ 14,000,000 | $ 98,000,000 | $ 2,000,000 |
Gains (losses) relating to ineffectiveness of foreign currency cash flow hedges | 0 | 0 | 0 | 0 |
Gain (losses) relating to ineffectiveness of forward starting interest rate derivatives | 0 | 0 | 0 | 0 |
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI | 154,000,000 |  | 154,000,000 |  | $ 210,000,000
Cash flow hedge unrealized gains to be reclassified over the next 12 months |  |  | 166,000,000 |  |
Gains (losses) relating to ineffectiveness of interest rate fair value hedges | 0 | 0 | 0 | 0 |
Cash flow hedging [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Effective portion of net gains (losses) on derivative instruments reclassified from accumulated other comprehensive loss | 74,000,000 | 21,000,000 | 148,000,000 | 19,000,000 |
Foreign currency exchange rate contracts [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | 10,086,000,000 |  | 10,086,000,000 |  | 9,782,000,000
Foreign currency exchange rate contracts [Member] | Not designated as hedging instrument [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | 3,653,000,000 |  | 3,653,000,000 |  | 4,713,000,000
Foreign currency exchange rate contracts [Member] | Designated as hedging instrument [Member] | Cash flow hedging [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | $ 6,433,000,000 |  | 6,433,000,000 |  | 5,069,000,000
Maximum remaining maturity of foreign currency derivatives | 3 years |  |  |  |
Interest rate swaps [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Unrealized gains (losses) on outstanding forward starting interest rate swap derivative instruments | $ (27,000,000) |  | (27,000,000) |  | (71,000,000)
Interest rate swaps [Member] | Cash flow hedging [Member] | Interest expense, net [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Effective portion of net gains (losses) on derivative instruments reclassified from accumulated other comprehensive loss | (3,000,000) | $ (2,000,000) | (6,000,000) | $ (4,000,000) |
Interest rate swaps [Member] | Designated as hedging instrument [Member] | Cash flow hedging [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | 300,000,000 |  | $ 300,000,000 |  |
Notional amount of derivatives terminated | 500,000,000 |  |  |  |
Payment for derivatives terminated | $ 45,000,000 |  |  |  |
Weighted average fixed rate of interest rate derivatives | 3.10% |  | 3.10% |  |
Interest rate swaps [Member] | Designated as hedging instrument [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | $ 1,425,000,000 |  | $ 1,425,000,000 |  | $ 2,025,000,000
Market value of outstanding interest rate swap agreements - net unrealized gain | 47,000,000 |  | 47,000,000 |  |
Market value of hedged item - net unrealized loss | $ 47,000,000 |  | $ 47,000,000 |  |

X
- 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 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=56946850&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=56946850&loc=SL5624177-113959 + 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=56946850&loc=SL5624171-113959 + Details
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- Definition Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated 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 -URI http://asc.fasb.org/extlink&oid=56946850&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 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 + 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=56944662&loc=d3e3581-108585 + Details
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