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Derivative Instruments - Additional Information (Details)
$ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Apr. 03, 2021
USD ($)
Apr. 03, 2021
USD ($)
Apr. 03, 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 $ 9        
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 366 $ 366   $ 53  
Derivatives designated as hedges | Interest rate | Fair Value Hedging          
Derivative [Line Items]          
Derivative, Notional Amount 15,200 15,200   15,800  
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging          
Derivative [Line Items]          
Derivative, Notional Amount 4,700 4,700   4,600  
Derivatives designated as hedges | Currency Swap | Fair Value Hedging          
Derivative [Line Items]          
Derivative, Notional Amount 1,000 1,000 $ 1,300 1,000 $ 1,300
Not Designated as Hedging Instrument | Foreign exchange          
Derivative [Line Items]          
Derivative, Notional Amount 4,200 4,200   3,500  
Not Designated as Hedging Instrument | Other Derivative          
Derivative [Line Items]          
Derivative, Notional Amount $ 300 $ 300   $ 300