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Condensed Consolidated Financial Statement Details - Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Mar. 27, 2021
Sep. 26, 2020
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 107,280 $ 103,526
Accumulated depreciation and amortization (69,465) (66,760)
Total property, plant and equipment, net 37,815 36,766
Land and buildings    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment 19,000 17,952
Machinery, equipment and internal-use software    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment 77,841 75,291
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Gross property, plant and equipment $ 10,439 $ 10,283