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Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 53,265 | $ 45,408 | $ 202,695 | $ 176,655
Operating income | 12,612 | 10,768 | 54,780 | 48,224
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 24,542 | 20,376 | 84,576 | 73,501
Operating income | 7,496 | 6,420 | 26,580 | 23,582
Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 12,138 | 10,675 | 47,038 | 41,929
Operating income | 3,892 | 2,984 | 15,044 | 12,571
Greater China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 9,551 | 8,004 | 40,531 | 34,963
Operating income | 3,414 | 3,002 | 15,285 | 13,402
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 3,867 | 3,624 | 16,572 | 13,875
Operating income | 1,765 | 1,624 | 7,193 | 6,334
Rest of Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 3,167 | 2,729 | 13,978 | 12,387
Operating income | $ 1,127 | $ 892 | $ 4,980 | $ 4,430

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