Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions	Apr. 01, 2017	Sep. 24, 2016
Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	$ 37,550	$ 44,678
Derivative, credit risk amount	691	518
Derivatives designated as accounting hedges | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	31,000	24,500
Derivative, credit risk amount	161	728
Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	50,573	54,305
Derivative, credit risk amount	$ 272	$ 153