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Segment Information and Geographic Data - Summary Information by Operating Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 52,579 | $ 45,408 | $ 52,896 | $ 78,351 | $ 46,852 | $ 42,358 | $ 50,557 | $ 75,872 | $ 229,234 | $ 215,639 | $ 233,715
Operating income |  |  |  |  |  |  |  |  | 61,344 | 60,024 | 71,230
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 96,600 | 86,613 | 93,864
Operating income |  |  |  |  |  |  |  |  | 30,684 | 28,172 | 31,186
Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 54,938 | 49,952 | 50,337
Operating income |  |  |  |  |  |  |  |  | 16,514 | 15,348 | 16,527
Greater China |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 44,764 | 48,492 | 58,715
Operating income |  |  |  |  |  |  |  |  | 17,032 | 18,835 | 23,002
Japan |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 17,733 | 16,928 | 15,706
Operating income |  |  |  |  |  |  |  |  | 8,097 | 7,165 | 7,617
Rest of Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 15,199 | 13,654 | 15,093
Operating income |  |  |  |  |  |  |  |  | $ 5,304 | $ 4,781 | $ 5,518

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