Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 416,161	$ 391,035	$ 383,285
Cost of sales	(220,960)	(210,352)	(214,137)
Research and development	(34,550)	(31,370)	(29,915)
Selling and marketing	(19,524)	(18,639)	(18,260)
General and administrative	(8,077)	(7,458)	(6,672)
Operating income	133,050	123,216	114,301
Corporate non-segment
Segment Reporting Information [Line Items]
Research and development	(34,550)	(31,370)	(29,915)
General and administrative	(8,077)	(7,458)	(6,672)
Operating income	(42,627)	(38,828)	(36,587)
Americas | Operating segments
Segment Reporting Information [Line Items]
Net sales	178,353	167,045	162,560
Cost of sales	(95,699)	(89,587)	(92,394)
Selling and marketing	(10,174)	(9,802)	(9,658)
Operating income	72,480	67,656	60,508
Europe | Operating segments
Segment Reporting Information [Line Items]
Net sales	111,032	101,328	94,294
Cost of sales	(58,617)	(55,197)	(54,101)
Selling and marketing	(4,676)	(4,341)	(4,095)
Operating income	47,739	41,790	36,098
Greater China | Operating segments
Segment Reporting Information [Line Items]
Net sales	64,377	66,952	72,559
Cost of sales	(35,141)	(37,519)	(39,787)
Selling and marketing	(2,319)	(2,351)	(2,444)
Operating income	26,917	27,082	30,328
Japan | Operating segments
Segment Reporting Information [Line Items]
Net sales	28,703	25,052	24,257
Cost of sales	(13,779)	(11,744)	(11,542)
Selling and marketing	(969)	(854)	(827)
Operating income	13,955	12,454	11,888
Rest of Asia Pacific | Operating segments
Segment Reporting Information [Line Items]
Net sales	33,696	30,658	29,615
Cost of sales	(17,724)	(16,305)	(16,313)
Selling and marketing	(1,386)	(1,291)	(1,236)
Operating income	$ 14,586	$ 13,062	$ 12,066