Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Segment Reporting Information [Line Items]
Net sales	$ 365,817	$ 274,515	$ 260,174
Operating income	108,949	66,288	63,930
Americas
Segment Reporting Information [Line Items]
Net sales	153,306	124,556	116,914
Operating income	53,382	37,722	35,099
Europe
Segment Reporting Information [Line Items]
Net sales	89,307	68,640	60,288
Operating income	32,505	22,170	19,195
Greater China
Segment Reporting Information [Line Items]
Net sales	68,366	40,308	43,678
Operating income	28,504	15,261	16,232
Japan
Segment Reporting Information [Line Items]
Net sales	28,482	21,418	21,506
Operating income	12,798	9,279	9,369
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	26,356	19,593	17,788
Operating income	$ 9,817	$ 6,808	$ 6,055