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Accounting Policies - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jul. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Significant Accounting Policies [Line Items]        
Operating income   $ 15,876 $ 12,686  
Net income   $ 13,893 $ 10,678  
Income per basic share   $ 1.84 $ 1.40  
Income per diluted share   $ 1.82 $ 1.38  
Other receivables due from suppliers   $ 1,100   $ 442
Long-term accounts receivable, net of allowance for doubtful accounts   2,700   2,700
Financing receivables, net   4,800   $ 5,200
Service Life        
Significant Accounting Policies [Line Items]        
Operating income   927    
Net income   $ 763    
Income per basic share   $ 0.10    
Income per diluted share   $ 0.10    
Server Equipment | Service Life        
Significant Accounting Policies [Line Items]        
Estimated useful lives 4 years     3 years
Network Equipment | Service Life        
Significant Accounting Policies [Line Items]        
Estimated useful lives 4 years     2 years