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Revenue Recognition - Disaggregation of Revenue by Geographical Market (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 4,228 | $ 4,596 | $ 8,386 | $ 8,800
Inter-segment elimination |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (64) | (91) | (131) | (174)
Americas | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,915 | 1,941 | 3,850 | 3,727
Americas | Operating segments | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,630 | 1,634 | 3,245 | 3,112
Americas | Operating segments | Mexico |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 643 | 656 | 1,313 | 1,280
Americas | Operating segments | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 100 | 135 | 224 | 280
Americas | Regional elimination |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (458) | (484) | (932) | (945)
EMEA | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,778 | 2,056 | 3,418 | 3,909
EMEA | Operating segments | Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 390 | 494 | 731 | 939
EMEA | Operating segments | Other EMEA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,904 | 2,112 | 3,650 | 3,988
EMEA | Regional elimination |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (516) | (550) | (963) | (1,018)
Asia | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 599 | 690 | 1,249 | 1,338
Asia | Operating segments | China |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 129 | 154 | 284 | 344
Asia | Operating segments | Other Asia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 471 | 536 | 967 | 994
Asia | Regional elimination |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ (1) | $ 0 | $ (2) | $ 0

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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