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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
12 Months Ended
Sep. 29, 2018
USD ($)
Item
Sep. 30, 2017
USD ($)
Sep. 24, 2016
USD ($)
Significant Accounting Policies [Line Items]      
Deliverables in arrangements (up to) | Item 3    
Depreciation and amortization expense $ 9,300 $ 8,200 $ 8,300
Non-cash investing activities involving property, plant and equipment, net increase to accounts payable and other current liabilities $ 3,400    
Accounting Standards Update 2016-09      
Significant Accounting Policies [Line Items]      
Increase to cash provided by operating activities   $ 627 $ 407
Building | Maximum      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 30 years    
Machinery and Equipment | Minimum      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 1 year    
Machinery and Equipment | Maximum      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 5 years    
Internal-Use Software | Minimum      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 3 years    
Internal-Use Software | Maximum      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 5 years