Segment Information and Geographic Data - Summary Information by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 01, 2017	Mar. 26, 2016	Apr. 01, 2017	Mar. 26, 2016
Segment Reporting Information [Line Items]
Net sales	$ 52,896	$ 50,557	$ 131,247	$ 126,429
Operating income	14,097	13,987	37,456	38,158
Americas
Segment Reporting Information [Line Items]
Net sales	21,157	19,096	53,125	48,421
Operating income	6,668	6,116	17,162	16,134
Europe
Segment Reporting Information [Line Items]
Net sales	12,733	11,535	31,254	29,467
Operating income	3,851	3,602	9,587	9,381
Greater China
Segment Reporting Information [Line Items]
Net sales	10,726	12,486	26,959	30,859
Operating income	4,224	4,818	10,400	12,394
Japan
Segment Reporting Information [Line Items]
Net sales	4,485	4,281	10,251	9,075
Operating income	2,037	1,930	4,710	4,170
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	3,795	3,159	9,658	8,607
Operating income	$ 1,309	$ 1,095	$ 3,538	$ 3,127