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Segment Information Geographic Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Geographic Area Information [Line Items] |  |  |
Net Sales | $ 30,172 | $ 20,837 | $ 17,100
Long-Lived Assets (Year-end) | 6,121 | 5,632 | 3,683
United States |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 14,495 | 9,633 | 8,982
Long-Lived Assets (Year-end) | 3,155 | 2,880 | 2,056
CHINA |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 2,046 | 1,620 | 1,350
Long-Lived Assets (Year-end) | 535 | 484 | 415
Germany |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 1,779 | 1,430 | 911
Long-Lived Assets (Year-end) | 290 | 287 | 304
United Kingdom |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 928 | 291 | 309
Long-Lived Assets (Year-end) | 109 | 103 | 4
JAPAN |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 1,816 | 1,805 | 315
Long-Lived Assets (Year-end) | 180 | 188 | 8
Mexico |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 840 | 639 | 635
Long-Lived Assets (Year-end) | 489 | 457 | 368
Other European Countries |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 2,860 | 1,817 | 1,961
Long-Lived Assets (Year-end) | 542 | 448 | 276
Other Foreign |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 5,408 | 3,602 | 2,637
Long-Lived Assets (Year-end) | $ 821 | $ 785 | $ 252

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