Segment Information and Geographic Data - Summary Information by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
Segment Reporting Information [Line Items]
Net sales	$ 45,408	$ 42,358	$ 176,655	$ 168,787
Operating income	10,768	10,105	48,224	48,263
Americas
Segment Reporting Information [Line Items]
Net sales	20,376	17,963	73,501	66,384
Operating income	6,420	5,453	23,582	21,587
Europe
Segment Reporting Information [Line Items]
Net sales	10,675	9,643	41,929	39,110
Operating income	2,984	2,666	12,571	12,047
Greater China
Segment Reporting Information [Line Items]
Net sales	8,004	8,848	34,963	39,707
Operating income	3,002	3,415	13,402	15,809
Japan
Segment Reporting Information [Line Items]
Net sales	3,624	3,529	13,875	12,604
Operating income	1,624	1,435	6,334	5,605
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	2,729	2,375	12,387	10,982
Operating income	$ 892	$ 753	$ 4,430	$ 3,880