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Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |
Net sales | $ 88,293 | $ 78,351
Operating income | 26,274 | 23,359
Americas |  |
Segment Reporting Information [Line Items] |  |
Net sales | 35,193 | 31,968
Operating income | 11,316 | 10,494
Europe |  |
Segment Reporting Information [Line Items] |  |
Net sales | 21,054 | 18,521
Operating income | 6,893 | 5,736
Greater China |  |
Segment Reporting Information [Line Items] |  |
Net sales | 17,956 | 16,233
Operating income | 6,908 | 6,176
Japan |  |
Segment Reporting Information [Line Items] |  |
Net sales | 7,237 | 5,766
Operating income | 3,082 | 2,673
Rest of Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Net sales | 6,853 | 5,863
Operating income | $ 2,575 | $ 2,229

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