Financial Instruments - Derivative Instruments at Gross Fair Value (Detail) - Level 2 - USD ($) $ in Millions	Sep. 24, 2016	Sep. 26, 2015
Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	$ 671	$ 1,551
Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	1,069	999
Interest rate contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	728	394
Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	7	13
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	518	1,442
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	935	905
Derivatives Designated as Hedging Instruments | Interest rate contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	728	394
Derivatives Designated as Hedging Instruments | Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	7	13
Not Designated as Hedging Instrument | Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair value of derivative assets	153	109
Not Designated as Hedging Instrument | Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair value of derivative liabilities	134	94
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