Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Segment Reporting Information [Line Items]
Net sales	$ 95,359	$ 90,753	$ 219,659	$ 210,328
Operating income	29,589	27,900	72,421	68,273
Americas
Segment Reporting Information [Line Items]
Net sales	40,315	37,273	92,963	87,703
Operating income	16,774	15,074	38,283	35,431
Europe
Segment Reporting Information [Line Items]
Net sales	24,454	24,123	58,315	54,520
Operating income	10,316	9,991	24,923	22,702
Greater China
Segment Reporting Information [Line Items]
Net sales	16,002	16,372	34,515	37,191
Operating income	6,626	6,700	14,786	15,322
Japan
Segment Reporting Information [Line Items]
Net sales	7,298	6,262	16,285	14,029
Operating income	3,434	3,135	7,748	6,954
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	7,290	6,723	17,581	16,885
Operating income	$ 2,986	$ 2,806	$ 7,570	$ 7,385