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Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Segment Reporting Information [Line Items]
Net sales	$ 91,819	$ 84,310
Operating income	25,569	23,346
Americas
Segment Reporting Information [Line Items]
Net sales	41,367	36,940
Operating income	13,092	11,200
Europe
Segment Reporting Information [Line Items]
Net sales	23,273	20,363
Operating income	7,719	6,658
Greater China
Segment Reporting Information [Line Items]
Net sales	13,578	13,169
Operating income	5,363	5,314
Japan
Segment Reporting Information [Line Items]
Net sales	6,223	6,910
Operating income	2,778	3,014
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	7,378	6,928
Operating income	$ 2,731	$ 2,560

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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