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Derivative Instruments - Additional Information (Details)
$ in Millions, $ in Millions
3 Months Ended
Jan. 02, 2021
USD ($)
Jan. 02, 2021
CAD ($)
Oct. 03, 2020
USD ($)
Oct. 03, 2020
CAD ($)
Derivative [Line Items]        
Net deferred gains recorded in AOCI for contracts that will mature in the next twelve months $ 102      
Hedging Period for Foreign Currency Transactions, Maximum 4 years      
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty $ 227   $ 53  
Derivatives designated as hedges | Interest rate | Fair Value Hedging        
Derivative [Line Items]        
Derivative, Notional Amount 15,900   15,800  
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging        
Derivative [Line Items]        
Derivative, Notional Amount 4,900   4,600  
Derivatives designated as hedges | Currency Swap | Fair Value Hedging        
Derivative [Line Items]        
Derivative, Notional Amount 1,000 $ 1,300 1,000 $ 1,300
Not Designated as Hedging Instrument | Foreign exchange        
Derivative [Line Items]        
Derivative, Notional Amount 3,500   3,500  
Not Designated as Hedging Instrument | Other Derivative        
Derivative [Line Items]        
Derivative, Notional Amount $ 300   $ 300