Consolidated Financial Statement Details - Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 75,076	$ 61,245
Accumulated depreciation and amortization	(41,293)	(34,235)
Total property, plant and equipment, net	33,783	27,010
Land and buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	13,587	10,185
Machinery, equipment and internal-use software
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	54,210	44,543
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 7,279	$ 6,517