Revenue Recognition - Net Sales Disaggregated by Significant Products and Services (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 58,313	$ 58,015	$ 150,132	$ 142,325
Revenue recognized that was included in deferred revenue at the beginning of the period	1,900	1,900	3,000	3,800
iPhone
Disaggregation of Revenue [Line Items]
Net sales	28,962	31,051	84,919	83,033
Mac
Disaggregation of Revenue [Line Items]
Net sales	5,351	5,513	12,511	12,929
iPad
Disaggregation of Revenue [Line Items]
Net sales	4,368	4,872	10,345	11,601
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	6,284	5,129	16,294	12,437
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 13,348	$ 11,450	$ 26,063	$ 22,325

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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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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