Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions	Jul. 01, 2017	Sep. 24, 2016
Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	$ 43,700	$ 44,678
Derivative, credit risk amount	485	518
Derivatives designated as accounting hedges | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	31,500	24,500
Derivative, credit risk amount	253	728
Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	48,774	54,305
Derivative, credit risk amount	$ 242	$ 153