Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 26, 2021	Sep. 26, 2020
Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivatives, notional amount	$ 53,914	$ 57,410
Derivatives, credit risk amount	700	749
Derivatives designated as accounting hedges | Interest rate contracts
Derivative [Line Items]
Derivatives, notional amount	17,500	20,700
Derivatives, credit risk amount	891	1,557
Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivatives, notional amount	95,910	88,636
Derivatives, credit risk amount	$ 510	$ 303