Condensed Consolidated Financial Statement Details - Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Jun. 27, 2020	Sep. 28, 2019
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 100,917	$ 95,957
Accumulated depreciation and amortization	(65,230)	(58,579)
Total property, plant and equipment, net	35,687	37,378
Land and buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	18,068	17,085
Machinery, equipment and internal-use software
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	72,982	69,797
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 9,867	$ 9,075