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Financial Instruments - Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Hedges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Cash flow hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | $ 1,804 | $ 52 | $ 3,481
Gains/(Losses) reclassified from AOCI into net income - effective portion | 1,956 | 874 | 4,075
Cash flow hedges | Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 1,797 | 109 | 3,592
Gains/(Losses) reclassified from AOCI into net income - effective portion | 1,958 | 885 | 4,092
Cash flow hedges | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 7 | (57) | (111)
Gains/(Losses) reclassified from AOCI into net income - effective portion | (2) | (11) | (17)
Net investment hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 67 | (258) | 96
Net investment hedges | Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 0 | 0 | 167
Net investment hedges | Foreign currency debt |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 67 | (258) | (71)
Fair value hedges | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) on derivative instruments | (810) | 341 | 337
Gains/(Losses) related to hedged fixed-rate debt | $ 810 | $ (341) | $ (337)

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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: 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=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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