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Financial Instruments - Marketable Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Dec. 29, 2018 | Sep. 29, 2018
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Fair Value of Marketable Debt Securities |  |
Continuous Unrealized Losses, Less than 12 Months | $ 53,336 | $ 126,238
Continuous Unrealized Losses, 12 Months or Greater | 127,006 | 60,599
Continuous Unrealized Losses, Total | 180,342 | 186,837
Unrealized Losses |  |
Continuous Unrealized Losses, Less than 12 Months | (1,153) | (2,400)
Continuous Unrealized Losses, 12 Months or Greater | (2,718) | (1,889)
Continuous Unrealized Losses, Total | $ (3,871) | $ (4,289)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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