Financial Instruments - Derivative Instruments at Gross Fair Value (Detail) - Level 2 - USD ($) $ in Millions	Dec. 31, 2016	Sep. 24, 2016
Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	$ 2,557	$ 671
Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	1,513	1,069
Interest rate contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	186	728
Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	331	7
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	1,453	518
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	977	935
Derivatives Designated as Hedging Instruments | Interest rate contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	186	728
Derivatives Designated as Hedging Instruments | Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	331	7
Not Designated as Hedging Instrument | Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	1,104	153
Not Designated as Hedging Instrument | Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	536	134
Not Designated as Hedging Instrument | Interest rate contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	0	0
Not Designated as Hedging Instrument | Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	$ 0	$ 0