Segment Information - Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2025	Dec. 28, 2024
Segment Reporting Information [Line Items]
Net sales	$ 143,756	$ 124,300
Cost of sales	(74,525)	(66,025)
Research and development	(10,887)	(8,268)
Selling and marketing	(5,397)	(5,101)
General and administrative	(2,095)	(2,074)
Operating income	50,852	42,832
Corporate non-segment
Segment Reporting Information [Line Items]
Research and development	(10,887)	(8,268)
General and administrative	(2,095)	(2,074)
Operating income	(12,982)	(10,342)
Americas | Operating segments
Segment Reporting Information [Line Items]
Net sales	58,529	52,648
Cost of sales	(31,849)	(28,495)
Selling and marketing	(2,727)	(2,644)
Operating income	23,953	21,509
Europe | Operating segments
Segment Reporting Information [Line Items]
Net sales	38,146	33,861
Cost of sales	(19,061)	(18,043)
Selling and marketing	(1,295)	(1,211)
Operating income	17,790	14,607
Greater China | Operating segments
Segment Reporting Information [Line Items]
Net sales	25,526	18,513
Cost of sales	(13,030)	(9,759)
Selling and marketing	(704)	(594)
Operating income	11,792	8,160
Japan | Operating segments
Segment Reporting Information [Line Items]
Net sales	9,413	8,987
Cost of sales	(4,511)	(4,393)
Selling and marketing	(289)	(280)
Operating income	4,613	4,314
Rest of Asia Pacific | Operating segments
Segment Reporting Information [Line Items]
Net sales	12,142	10,291
Cost of sales	(6,074)	(5,335)
Selling and marketing	(382)	(372)
Operating income	$ 5,686	$ 4,584