Summary Information by Operating Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Segment Reporting Information [Line Items]
Net sales	$ 75,872	$ 74,599
Operating income	24,171	24,246
Americas
Segment Reporting Information [Line Items]
Net sales	29,325	30,566
Operating income	10,018	10,701
Europe
Segment Reporting Information [Line Items]
Net sales	17,932	17,214
Operating income	5,779	5,882
Greater China
Segment Reporting Information [Line Items]
Net sales	18,373	16,144
Operating income	7,576	6,366
Japan
Segment Reporting Information [Line Items]
Net sales	4,794	5,448
Operating income	2,240	2,488
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	5,448	5,227
Operating income	$ 2,032	$ 1,849