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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Revenue Recognition - Net Sales Disaggregated by Significant Products and Services (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 64,040	$ 53,809	$ 58,015	$ 84,310	$ 62,900	$ 53,265	$ 61,137	$ 88,293	$ 260,174	$ 265,595	$ 229,234
Revenue recognized that was included in deferred revenue at the beginning of the period									5,900	5,800	6,300
iPhone
Disaggregation of Revenue [Line Items]
Net sales									142,381	164,888	139,337
Mac
Disaggregation of Revenue [Line Items]
Net sales									25,740	25,198	25,569
iPad
Disaggregation of Revenue [Line Items]
Net sales									21,280	18,380	18,802
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales									24,482	17,381	12,826
Services
Disaggregation of Revenue [Line Items]
Net sales									$ 46,291	$ 39,748	$ 32,700