Financial Instruments - Notional Amounts of Outstanding Derivative Instruments and Credit Risk Amounts Associated with Outstanding or Unsettled Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Sep. 24, 2016
Derivatives Designated as Hedging Instruments | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	$ 40,526	$ 44,678
Derivative, credit risk amount	1,453	518
Derivatives Designated as Hedging Instruments | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	24,500	24,500
Derivative, credit risk amount	186	728
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	57,144	54,305
Derivative, credit risk amount	$ 1,104	$ 153