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Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Mar. 28, 2020 | Mar. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 58,313 | $ 58,015 | $ 150,132 | $ 142,325
Operating income | 12,853 | 13,415 | 38,422 | 36,761
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 25,473 | 25,596 | 66,840 | 62,536
Operating income | 7,261 | 7,687 | 20,353 | 18,887
Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 14,294 | 13,054 | 37,567 | 33,417
Operating income | 4,528 | 4,026 | 12,247 | 10,684
Greater China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 9,455 | 10,218 | 23,033 | 23,387
Operating income | 3,758 | 3,607 | 9,121 | 8,921
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 5,206 | 5,532 | 11,429 | 12,442
Operating income | 2,236 | 2,390 | 5,014 | 5,404
Rest of Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 3,885 | 3,615 | 11,263 | 10,543
Operating income | $ 1,290 | $ 1,096 | $ 4,021 | $ 3,656

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