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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. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 29, 2018 | Sep. 30, 2017 | Sep. 24, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 62,900 | $ 53,265 | $ 61,137 | $ 88,293 | $ 52,579 | $ 45,408 | $ 52,896 | $ 78,351 | $ 265,595 | $ 229,234 | $ 215,639
Operating income |  |  |  |  |  |  |  |  | 70,898 | 61,344 | 60,024
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 112,093 | 96,600 | 86,613
Operating income |  |  |  |  |  |  |  |  | 34,864 | 30,684 | 28,172
Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 62,420 | 54,938 | 49,952
Operating income |  |  |  |  |  |  |  |  | 19,955 | 16,514 | 15,348
Greater China |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 51,942 | 44,764 | 48,492
Operating income |  |  |  |  |  |  |  |  | 19,742 | 17,032 | 18,835
Japan |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21,733 | 17,733 | 16,928
Operating income |  |  |  |  |  |  |  |  | 9,500 | 8,097 | 7,165
Rest of Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 17,407 | 15,199 | 13,654
Operating income |  |  |  |  |  |  |  |  | $ 6,181 | $ 5,304 | $ 4,781

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