Financial Instruments - Derivative Instruments Designated as Fair Value Hedges and Related Hedged Items (Details) - USD ($) $ in Millions	Sep. 25, 2021	Sep. 26, 2020
Current and non-current marketable securities \| Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of hedged marketable securities	$ 15,954	$ 16,270
Current and non-current term debt \| Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of hedged term debt	$ (17,857)	$ (21,033)

Amount of liability hedged in fair value hedging relationship.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

Name:	us-gaap_HedgedLiabilityFairValueHedge
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant