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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. 29, 2018 | Sep. 30, 2017 | Sep. 24, 2016
Cash flow hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | $ 683 | $ 1,804 | $ 52
Gains/(Losses) reclassified from AOCI into net income - effective portion | (481) | 1,956 | 874
Cash flow hedges | Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 682 | 1,797 | 109
Gains/(Losses) reclassified from AOCI into net income - effective portion | (482) | 1,958 | 885
Cash flow hedges | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 1 | 7 | (57)
Gains/(Losses) reclassified from AOCI into net income - effective portion | 1 | (2) | (11)
Net investment hedges | Foreign currency debt |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) recognized in OCI - effective portion | 4 | 67 | (258)
Fair value hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) on derivative instruments | (1,531) | (810) | 341
Gains/(Losses) related to hedged items | 1,530 | 810 | (341)
Fair value hedges | Foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) on derivative instruments | (168) | 0 | 0
Gains/(Losses) related to hedged items | 167 | 0 | 0
Fair value hedges | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) on derivative instruments | (1,363) | (810) | 341
Gains/(Losses) related to hedged items | $ 1,363 | $ 810 | $ (341)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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