Derivative Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015	Oct. 31, 2017
Derivative [Line Items]
Hedging period for foreign currency transactions, maximum	4 years
Net deferred loss recorded in AOCI for contracts that will be reclassified to earnings in the next twelve months	$ (56)
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty	217	$ 86
Interest rate | Interest expense, net
Derivative [Line Items]
Realized benefit from derivative instruments	35	94	$ 97
Derivatives designated as hedges | Interest rate | Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	8,200	8,300
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,300	5,600
Derivatives not designated as hedges | Interest rate
Derivative [Line Items]
Derivative, Notional Amount	500
Derivatives not designated as hedges | Foreign exchange
Derivative [Line Items]
Derivative, Notional Amount	$ 3,600	$ 3,300
Subsequent Event [Member] | Derivatives not designated as hedges | Interest rate
Derivative [Line Items]
Derivative, Notional Amount				$ 500