Reconciliation of Segment Operating Income to Condensed Consolidated Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2011		Dec. 25, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Share-based compensation expense	$ (420)		$ (299)
Other corporate expenses, net	(1,324)	[1]	(1,149)	[1]
Operating income	17,340		7,827
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 19,084		$ 9,275

[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.