Condensed Consolidated Financial Statement Details - Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Mar. 30, 2019	Sep. 29, 2018
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 93,036	$ 90,403
Accumulated depreciation and amortization	(54,290)	(49,099)
Total property, plant and equipment, net	38,746	41,304
Land and buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	16,308	16,216
Machinery, equipment and internal-use software
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	68,139	65,982
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 8,589	$ 8,205