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Financial Instruments - Marketable Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Sep. 30, 2017
--- | --- | ---
Fair Value of Marketable Securities |  |
Continuous Unrealized Losses, Less than 12 Months | $ 126,238 | $ 101,986
Continuous Unrealized Losses, 12 Months or Greater | 60,599 | 8,290
Continuous Unrealized Losses, Total | 186,837 | 110,276
Unrealized Losses |  |
Continuous Unrealized Losses, Less than 12 Months | (2,400) | (596)
Continuous Unrealized Losses, 12 Months or Greater | (1,889) | (186)
Continuous Unrealized Losses, Total | $ (4,289) | $ (782)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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