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Marketable Securities (Details) - USD ($) $ in Millions | Dec. 26, 2021 | Sep. 26, 2021
--- | --- | ---
Marketable Securities |  |
Available-for-sale Securities, Current | $ 4,003 | $ 4,616
Marketable securities | 4,703 | 5,298
Less than one year | 566 |
One to five years | 3,300 |
No single maturity date | 137 |
Debt Securities, Available-for-sale | 4,003 |
Corporate bonds and notes |  |
Marketable Securities |  |
Available-for-sale Securities, Current | 3,856 | 4,459
Mortgage- and asset-backed securities |  |
Marketable Securities |  |
Available-for-sale Securities, Current | 137 | 147
U.S. Treasury and government-related Securities |  |
Marketable Securities |  |
Available-for-sale Securities, Current | 10 | 10
Equity securities |  |
Marketable Securities |  |
Marketable securities | $ 700 | $ 682

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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