Segment Information and Geographic Data - Reconciliation of Segment Operating Income to the Consolidated Statements of Operations (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 66,288	$ 63,930	$ 70,898
Research and development expense	(18,752)	(16,217)	(14,236)
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	91,240	85,950	90,242
Segment reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	(18,752)	(16,217)	(14,236)
Corporate non-segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other corporate expenses, net	$ (6,200)	$ (5,803)	$ (5,108)

The net result for the period of deducting operating expenses from operating revenues.

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