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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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