Revenue Recognition - Net Sales Disaggregated by Significant Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 28, 2019	Dec. 29, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 91,819	$ 84,310
Revenue recognized that was included in deferred revenue at the beginning of the period	1,900	2,400
iPhone
Disaggregation of Revenue [Line Items]
Net sales	55,957	51,982
Mac
Disaggregation of Revenue [Line Items]
Net sales	7,160	7,416
iPad
Disaggregation of Revenue [Line Items]
Net sales	5,977	6,729
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	10,010	7,308
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 12,715	$ 10,875

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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