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Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 64,040 | $ 53,809 | $ 58,015 | $ 84,310 | $ 62,900 | $ 53,265 | $ 61,137 | $ 88,293 | $ 260,174 | $ 265,595 | $ 229,234
Operating income |  |  |  |  |  |  |  |  | 63,930 | 70,898 | 61,344
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 116,914 | 112,093 | 96,600
Operating income |  |  |  |  |  |  |  |  | 35,099 | 34,864 | 30,684
Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 60,288 | 62,420 | 54,938
Operating income |  |  |  |  |  |  |  |  | 19,195 | 19,955 | 16,514
Greater China |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 43,678 | 51,942 | 44,764
Operating income |  |  |  |  |  |  |  |  | 16,232 | 19,742 | 17,032
Japan |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,506 | 21,733 | 17,733
Operating income |  |  |  |  |  |  |  |  | 9,369 | 9,500 | 8,097
Rest of Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 17,788 | 17,407 | 15,199
Operating income |  |  |  |  |  |  |  |  | $ 6,055 | $ 6,181 | $ 5,304

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