Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 64,040	$ 53,809	$ 58,015	$ 84,310	$ 62,900	$ 53,265	$ 61,137	$ 88,293	$ 260,174	$ 265,595	$ 229,234
Operating income									63,930	70,898	61,344
Americas
Segment Reporting Information [Line Items]
Net sales									116,914	112,093	96,600
Operating income									35,099	34,864	30,684
Europe
Segment Reporting Information [Line Items]
Net sales									60,288	62,420	54,938
Operating income									19,195	19,955	16,514
Greater China
Segment Reporting Information [Line Items]
Net sales									43,678	51,942	44,764
Operating income									16,232	19,742	17,032
Japan
Segment Reporting Information [Line Items]
Net sales									21,506	21,733	17,733
Operating income									9,369	9,500	8,097
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales									17,788	17,407	15,199
Operating income									$ 6,055	$ 6,181	$ 5,304