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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. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 53,809 | $ 53,265 | $ 196,134 | $ 202,695
Operating income | 11,544 | 12,612 | 48,305 | 54,780
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 25,056 | 24,542 | 87,592 | 84,576
Operating income | 7,442 | 7,496 | 26,329 | 26,580
Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 11,925 | 12,138 | 45,342 | 47,038
Operating income | 3,687 | 3,892 | 14,371 | 15,044
Greater China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 9,157 | 9,551 | 32,544 | 40,531
Operating income | 3,221 | 3,414 | 12,142 | 15,285
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 4,082 | 3,867 | 16,524 | 16,572
Operating income | 1,795 | 1,765 | 7,199 | 7,193
Rest of Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 3,589 | 3,167 | 14,132 | 13,978
Operating income | $ 1,155 | $ 1,127 | $ 4,811 | $ 4,980

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