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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. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 61,137 | $ 52,896 | $ 149,430 | $ 131,247
Operating income | 15,894 | 14,097 | 42,168 | 37,456
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 24,841 | 21,157 | 60,034 | 53,125
Operating income | 7,768 | 6,668 | 19,084 | 17,162
Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 13,846 | 12,733 | 34,900 | 31,254
Operating income | 4,259 | 3,851 | 11,152 | 9,587
Greater China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 13,024 | 10,726 | 30,980 | 26,959
Operating income | 4,963 | 4,224 | 11,871 | 10,400
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 5,468 | 4,485 | 12,705 | 10,251
Operating income | 2,346 | 2,037 | 5,428 | 4,710
Rest of Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 3,958 | 3,795 | 10,811 | 9,658
Operating income | $ 1,278 | $ 1,309 | $ 3,853 | $ 3,538

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