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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 11, 2018
Sep. 30, 2016
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Commitments and Contingencies Disclosure [Line Items]          
Total future minimum lease payments under noncancelable operating leases     $ 10,838    
Typical term of leases (not exceeding)     10 years    
Rent expense under cancelable and noncancelable operating leases     $ 1,300 $ 1,200 $ 1,100
VirnetX I | Pending Litigation          
Commitments and Contingencies Disclosure [Line Items]          
Award from legal proceedings, due to other party   $ 302      
Award from legal proceeding, due to other party, revised amount, determined in subsequent proceedings   $ 440      
VirnetX II | Pending Litigation          
Commitments and Contingencies Disclosure [Line Items]          
Award from legal proceedings, due to other party $ 503