Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Net sales	$ 59,685	$ 53,809	$ 209,817	$ 196,134
Operating income	13,091	11,544	51,513	48,305
Americas
Segment Reporting Information [Line Items]
Net sales	27,018	25,056	93,858	87,592
Operating income	7,974	7,442	28,327	26,329
Europe
Segment Reporting Information [Line Items]
Net sales	14,173	11,925	51,740	45,342
Operating income	4,420	3,687	16,667	14,371
Greater China
Segment Reporting Information [Line Items]
Net sales	9,329	9,157	32,362	32,544
Operating income	3,414	3,221	12,535	12,142
Japan
Segment Reporting Information [Line Items]
Net sales	4,966	4,082	16,395	16,524
Operating income	2,114	1,795	7,128	7,199
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	4,199	3,589	15,462	14,132
Operating income	$ 1,374	$ 1,155	$ 5,395	$ 4,811