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Investments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]      
Excess book value of equity method investments representing intangible assets and goodwill $ 1,200    
Revenue from Related Parties 500 $ 800 $ 500
Equity Securities without Readily Determinable Fair Value, Amount $ 290    
A&E      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Interest 50.00%    
CTV Specialty Television, Inc.      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Interest 30.00%    
Endemol Shine Group      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Interest 50.00%    
Seven TV      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Interest 20.00%    
Tata Sky Limited      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Interest 30.00%