Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 124,300	$ 119,575
Operating income	42,832	40,373
Americas
Segment Reporting Information [Line Items]
Net sales	52,648	50,430
Operating income	21,509	20,357
Europe
Segment Reporting Information [Line Items]
Net sales	33,861	30,397
Operating income	14,607	12,711
Greater China
Segment Reporting Information [Line Items]
Net sales	18,513	20,819
Operating income	8,160	8,622
Japan
Segment Reporting Information [Line Items]
Net sales	8,987	7,767
Operating income	4,314	3,819
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	10,291	10,162
Operating income	$ 4,584	$ 4,579