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Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019
Segment Reporting Information [Line Items] |  |
Net sales | $ 111,439 | $ 91,819
Operating income | 33,534 | 25,569
Americas |  |
Segment Reporting Information [Line Items] |  |
Net sales | 46,310 | 41,367
Operating income | 15,785 | 13,092
Europe |  |
Segment Reporting Information [Line Items] |  |
Net sales | 27,306 | 23,273
Operating income | 9,589 | 7,719
Greater China |  |
Segment Reporting Information [Line Items] |  |
Net sales | 21,313 | 13,578
Operating income | 8,530 | 5,363
Japan |  |
Segment Reporting Information [Line Items] |  |
Net sales | 8,285 | 6,223
Operating income | 3,503 | 2,778
Rest of Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Net sales | 8,225 | 7,378
Operating income | $ 2,953 | $ 2,731

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