Derivative Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 29, 2014	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Hedging period for foreign currency transactions, maximum		4 years
Net deferred gain recorded in AOCI for contracts that will be reclassified to earnings in the next twelve months		$ 346
Net gains (losses) on foreign currency denominated assets and liabilities		0	$ (143)	$ 0
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty		7	34
Venezuelan bolívar fuerte | SICAD 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ (143)		143
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities		42	24	199
Interest rate | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Realized benefit from derivative instruments		97	93	$ 80
Interest rate | Derivatives designated as hedges | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		6,400	6,800
Foreign exchange | Derivatives designated as hedges | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		6,500	5,000
Foreign exchange | Derivatives not designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 3,300	$ 4,300