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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Sep. 30, 2018
Oct. 01, 2017
Sep. 25, 2016
Significant Accounting Policies [Line Items]            
Increase to net deferred tax assets upon adoption of ASU 2016-16 $ 8,045 $ 5,834        
Reduction to other non-current assets upon adoption of ASU 2016-16 $ (32,978) (22,283)        
Potentially dilutive securities excluded from the computation of diluted earnings per share because their effect would have been antidilutive (in shares) 15.5          
Depreciation and amortization expense on property and equipment $ 11,300 9,300 $ 8,200      
Non-cash investing activities involving property, plant and equipment, net increase/(decrease) to accounts payable and other current liabilities $ (2,900) $ 3,400        
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          
Retained earnings            
Significant Accounting Policies [Line Items]            
Increase to retained earnings upon adoption of ASU 2016-16       $ 2,501 $ 278 $ 0
Accounting Standards Update 2016-16            
Significant Accounting Policies [Line Items]            
Increase to net deferred tax assets upon adoption of ASU 2016-16       2,700    
Reduction to other non-current assets upon adoption of ASU 2016-16       128    
Accounting Standards Update 2016-16 | Retained earnings            
Significant Accounting Policies [Line Items]            
Increase to retained earnings upon adoption of ASU 2016-16       $ 2,600