Dispositions and Other Income/(Expense) - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Schedule of Other Income and Expense [Line Items]
Gain from acquisition of BAMTech	$ 255	$ 0	$ 0
Litigation Settlement	(177)	$ 0	$ 0
Litigation settlement net of insurance
Schedule of Other Income and Expense [Line Items]
Litigation Settlement	177
BAMTech, LLC
Schedule of Other Income and Expense [Line Items]
Gain from acquisition of BAMTech	$ 255