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Summary of Significant Accounting Policies - Additional Information (Details)
shares in Millions, $ in Millions
12 Months Ended
Aug. 28, 2020
Sep. 26, 2020
USD ($)
Sep. 28, 2019
USD ($)
shares
Sep. 29, 2018
USD ($)
Sep. 29, 2019
USD ($)
Sep. 30, 2017
USD ($)
Significant Accounting Policies [Line Items]            
Common stock split ratio 4          
Right-of-use assets recorded upon adoption of new leases standard   $ 9,199        
Lease liabilities recorded upon adoption of new leases standard   9,842        
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12   65,339 $ 90,488 $ 107,147   $ 134,047
Potentially dilutive securities excluded from the computation of diluted earnings per share because their effect would have been antidilutive (in shares) | shares     62      
Depreciation and amortization expense on property and equipment   $ 9,700 $ 11,300 9,300    
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   40 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   7 years        
Accumulated other comprehensive income/(loss)            
Significant Accounting Policies [Line Items]            
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12   $ (406) (584) (3,454)   (150)
Accumulated other comprehensive income/(loss) | Cumulative Effect, Period of Adoption, Adjustment            
Significant Accounting Policies [Line Items]            
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12     136 89   (278)
Retained earnings            
Significant Accounting Policies [Line Items]            
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12   $ 14,966 45,898 70,400   98,330
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment            
Significant Accounting Policies [Line Items]            
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12     (136) $ 2,501   $ 278
Accounting Standards Update 2016-02            
Significant Accounting Policies [Line Items]            
Right-of-use assets recorded upon adoption of new leases standard         $ 7,500  
Lease liabilities recorded upon adoption of new leases standard         $ 8,100  
Accounting Standards Update 2017-12 | Accumulated other comprehensive income/(loss) | Cumulative Effect, Period of Adoption, Adjustment            
Significant Accounting Policies [Line Items]            
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12     136      
Accounting Standards Update 2017-12 | Retained earnings | Cumulative Effect, Period of Adoption, Adjustment            
Significant Accounting Policies [Line Items]            
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12     $ (136)