Reconciliation of Segment Operating Income to Condensed Consolidated Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2012		Mar. 26, 2011		Mar. 31, 2012		Mar. 26, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Share-based compensation expense	$ (424)		$ (287)		$ (844)		$ (586)
Other corporate expenses, net	(1,135)	[1]	(1,661)	[1]	(2,459)	[1]	(2,810)	[1]
Operating income	15,384		7,874		32,724		15,701
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 16,943		$ 9,822		$ 36,027		$ 19,097

[1] Other corporate expenses include research and development, corporate marketing expenses, manufacturing costs and variances not included in standard costs, and other separately managed general and administrative expenses.