Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 26, 2022	Mar. 27, 2021	Mar. 26, 2022	Mar. 27, 2021
Segment Reporting Information [Line Items]
Net sales	$ 97,278	$ 89,584	$ 221,223	$ 201,023
Operating income	29,979	27,503	71,467	61,037
Americas
Segment Reporting Information [Line Items]
Net sales	40,882	34,306	92,378	80,616
Operating income	15,279	12,050	34,864	27,835
Europe
Segment Reporting Information [Line Items]
Net sales	23,287	22,264	53,036	49,570
Operating income	8,505	8,265	20,050	17,854
Greater China
Segment Reporting Information [Line Items]
Net sales	18,343	17,728	44,126	39,041
Operating income	8,112	7,758	19,295	16,288
Japan
Segment Reporting Information [Line Items]
Net sales	7,724	7,742	14,831	16,027
Operating income	3,496	3,428	6,845	6,931
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	7,042	7,544	16,852	15,769
Operating income	$ 2,823	$ 2,736	$ 6,818	$ 5,689