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Financial Instruments - Notional Amounts of Derivative Instruments (Details) - USD ($)
$ in Millions
Sep. 25, 2021
Sep. 26, 2020
Derivative instruments designated as accounting hedges | Foreign exchange contracts    
Derivative [Line Items]    
Derivatives, notional amount $ 76,475 $ 57,410
Derivative instruments designated as accounting hedges | Interest rate contracts    
Derivative [Line Items]    
Derivatives, notional amount 16,875 20,700
Derivative instruments not designated as accounting hedges | Foreign exchange contracts    
Derivative [Line Items]    
Derivatives, notional amount $ 126,918 $ 88,636