Derivative Instruments - Additional Information (Details) $ in Millions, $ in Billions	3 Months Ended
	Dec. 28, 2024 USD ($)	Dec. 28, 2024 CAD ($)	Sep. 28, 2024 USD ($)	Sep. 28, 2024 CAD ($)
Derivative [Line Items]
Net deferred gains recorded in AOCI for contracts that will mature in the next twelve months	$ 501
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	$ 900		$ 1,100
Costs and Expenses
Derivative [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	200
Derivatives designated as hedges | Interest rate | Fair Value Hedging
Derivative [Line Items]
Derivative, Notional Amount	11,000		12,000
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	8,400		9,900
Derivatives designated as hedges | Currency Swap | Fair Value Hedging
Derivative [Line Items]
Derivative, Notional Amount	900	$ 1.3	1,000	$ 1.3
Not Designated as Hedging Instrument | Foreign exchange
Derivative [Line Items]
Derivative, Notional Amount	2,900		3,400
Not Designated as Hedging Instrument | Other Derivative
Derivative [Line Items]
Derivative, Notional Amount	$ 600		$ 500