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Segment Information Geographic Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Geographic Area Information [Line Items] |  |  |
Net Sales | $ 31,400 | $ 30,172 | $ 20,837
Long-Lived Assets (Year-end) | 6,171 | 6,121 | 5,632
UNITED STATES |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 14,625 | 14,495 | 9,633
Long-Lived Assets (Year-end) | 3,216 | 3,155 | 2,880
CHINA |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 2,166 | 2,046 | 1,620
Long-Lived Assets (Year-end) | 766 | 535 | 484
Germany |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 1,961 | 1,779 | 1,430
Long-Lived Assets (Year-end) | 275 | 290 | 287
United Kingdom |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 1,139 | 928 | 291
Long-Lived Assets (Year-end) | 73 | 109 | 103
JAPAN |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 1,903 | 1,816 | 1,805
Long-Lived Assets (Year-end) | 209 | 180 | 188
Mexico |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 909 | 840 | 639
Long-Lived Assets (Year-end) | 531 | 489 | 457
Other European Countries |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 3,005 | 2,860 | 1,817
Long-Lived Assets (Year-end) | 442 | 542 | 448
Other Foreign |  |  |
Geographic Area Information [Line Items] |  |  |
Net Sales | 5,692 | 5,408 | 3,602
Long-Lived Assets (Year-end) | $ 659 | $ 821 | $ 785

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