Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Segment Reporting Information [Line Items]
Net sales	$ 123,945	$ 111,439
Operating income	41,488	33,534
Americas
Segment Reporting Information [Line Items]
Net sales	51,496	46,310
Operating income	19,585	15,785
Europe
Segment Reporting Information [Line Items]
Net sales	29,749	27,306
Operating income	11,545	9,589
Greater China
Segment Reporting Information [Line Items]
Net sales	25,783	21,313
Operating income	11,183	8,530
Japan
Segment Reporting Information [Line Items]
Net sales	7,107	8,285
Operating income	3,349	3,503
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	9,810	8,225
Operating income	$ 3,995	$ 2,953