Reconciliation of Segment Operating Income to Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 24,171	$ 24,246
Research and development expense	(2,404)	(1,895)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	27,645	27,286
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	(2,404)	(1,895)
Corporate Non-Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other corporate expenses, net	$ (1,070)	$ (1,145)