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Acquisitions - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 20, 2019
Oct. 02, 2021
Oct. 03, 2020
Sep. 28, 2019
Aug. 31, 2019
Apr. 15, 2019
Business Acquisition and Equity Method Investment [Line Items]            
Equity-based compensation   $ 600 $ 525 $ 711    
RSU compensation expense   505 424 627 [1]    
Equity Method Investment, Realized Gain (Loss) on Disposal   $ 0 65 0    
Hulu LLC            
Business Acquisition and Equity Method Investment [Line Items]            
Hulu Gain $ 4,800          
Equity Method Investment, Ownership Interest 60.00% 67.00%        
Hulu LLC | Equity Interest Held by Warner Media LLC            
Business Acquisition and Equity Method Investment [Line Items]            
Equity Method Investment, Ownership Interest           10.00%
Redeemable Noncontrolling Interest, Equity, Redemption Value           $ 1,400
Hulu LLC | Equity Interest Held by NBC Universal            
Business Acquisition and Equity Method Investment [Line Items]            
Equity Method Investment, Ownership Interest   33.00%        
Sky plc | Equity Interest Held by TFCF            
Business Acquisition and Equity Method Investment [Line Items]            
Equity Method Investment, Realized Gain (Loss) on Disposal       $ 10,800    
Equity Method Investment, Other Transaction Details       39.00%    
Regional Sports Networks            
Business Acquisition and Equity Method Investment [Line Items]            
Disposal Group, Including Discontinued Operation, Consideration         $ 11,000  
Discontinued Operations [Member] | Pro Forma            
Business Acquisition and Equity Method Investment [Line Items]            
Disposal Group, Including Discontinued Operation, Operating Income (Loss)       $ 900    
Restricted Stock Units            
Business Acquisition and Equity Method Investment [Line Items]            
Unrecognized compensation costs   $ 1,202        
TFCF            
Business Acquisition and Equity Method Investment [Line Items]            
Business Combination, Consideration Transferred $ 69,500          
Payments to Acquire Businesses, Gross 35,700          
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 33,800          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 307          
Business Acquisition, Share Price $ 110.00          
Equity-based compensation $ 361          
RSU compensation expense       164    
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized       300    
TFCF | Pro Forma            
Business Acquisition and Equity Method Investment [Line Items]            
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized       400    
Interest Expense, Debt       400    
TFCF | Selling, General and Administrative Expenses            
Business Acquisition and Equity Method Investment [Line Items]            
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized       200    
TFCF | Interest expense, net            
Business Acquisition and Equity Method Investment [Line Items]            
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized       100    
TFCF | Film and Television Production Cost | Pro Forma            
Business Acquisition and Equity Method Investment [Line Items]            
Amortization       3,100    
TFCF | Film and Television Production Cost | Regional Sports Networks | Pro Forma            
Business Acquisition and Equity Method Investment [Line Items]            
Amortization       400    
TFCF | Restricted Stock Units            
Business Acquisition and Equity Method Investment [Line Items]            
Unrecognized compensation costs 219          
TFCF | Acceleration            
Business Acquisition and Equity Method Investment [Line Items]            
RSU compensation expense $ 164          
TFCF | Acceleration | Pro Forma            
Business Acquisition and Equity Method Investment [Line Items]            
RSU compensation expense       200    
TFCF and Hulu            
Business Acquisition and Equity Method Investment [Line Items]            
Amortization   $ 646 $ 899 $ 537    
TFCF and Hulu | Hulu LLC | Equity Interest Held by TFCF            
Business Acquisition and Equity Method Investment [Line Items]            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 30.00%          
[1] Fiscal 2019 includes a $164 million charge for acceleration of TFCF performance RSUs converted to Company RSUs in connection with the TFCF acquisition (see Note 4).