Segment Information and Geographic Data - Summary Information by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Segment Reporting Information [Line Items]
Net sales	$ 52,579	$ 45,408	$ 52,896	$ 78,351	$ 46,852	$ 42,358	$ 50,557	$ 75,872	$ 229,234	$ 215,639	$ 233,715
Operating income									61,344	60,024	71,230
Americas
Segment Reporting Information [Line Items]
Net sales									96,600	86,613	93,864
Operating income									30,684	28,172	31,186
Europe
Segment Reporting Information [Line Items]
Net sales									54,938	49,952	50,337
Operating income									16,514	15,348	16,527
Greater China
Segment Reporting Information [Line Items]
Net sales									44,764	48,492	58,715
Operating income									17,032	18,835	23,002
Japan
Segment Reporting Information [Line Items]
Net sales									17,733	16,928	15,706
Operating income									8,097	7,165	7,617
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales									15,199	13,654	15,093
Operating income									$ 5,304	$ 4,781	$ 5,518