Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Segment Reporting Information [Line Items]
Net sales	$ 62,900	$ 53,265	$ 61,137	$ 88,293	$ 52,579	$ 45,408	$ 52,896	$ 78,351	$ 265,595	$ 229,234	$ 215,639
Operating income									70,898	61,344	60,024
Americas
Segment Reporting Information [Line Items]
Net sales									112,093	96,600	86,613
Operating income									34,864	30,684	28,172
Europe
Segment Reporting Information [Line Items]
Net sales									62,420	54,938	49,952
Operating income									19,955	16,514	15,348
Greater China
Segment Reporting Information [Line Items]
Net sales									51,942	44,764	48,492
Operating income									19,742	17,032	18,835
Japan
Segment Reporting Information [Line Items]
Net sales									21,733	17,733	16,928
Operating income									9,500	8,097	7,165
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales									17,407	15,199	13,654
Operating income									$ 6,181	$ 5,304	$ 4,781