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Restructuring and Impairment Costs (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 USD ($) employee | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) employee plant | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Underspend |  |  |  |  | $ 7 |  |
Restructuring and impairment costs | $ 113 | $ 315 | $ 144 | $ 315 |  |  |
Number of positions eliminated to date | employee | 7,300 |  | 7,300 |  |  |  |
Number of positions eliminated | employee |  |  | 5,000 |  |  |  |
Number of plants expected to close | plant |  |  | 15 |  |  |  |
Number of plants closed | plant |  |  | 11 |  |  |  |
Fixed asset impairment charges | $ 66 |  |  |  |  |  |
Goodwill impairment charge | 299 | $ 299 |  |  |  |  |
2019 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  | $ 80 |  |  |  |
Underspend |  |  | (8) |  |  |  |
2018 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  |  |  | 71 |  |
Underspend |  |  | (2) |  |  |  |
2018 Restructuring Plan | Employee Severance and Termination Benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Underspend |  |  | (2) |  |  |  |
2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | $ 46 |
2017 Restructuring Plan | Employee Severance and Termination Benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Underspend |  |  |  |  | 6 |  |
2016 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Underspend |  |  |  |  | 20 |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 332
2016 Restructuring Plan | Employee Severance and Termination Benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Underspend |  |  |  |  | 20 |  |
Fixed Assets |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Fixed asset impairment charges | 62 |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Fixed asset impairment charges | 4 |  |  |  |  |  |
Asia | 2019 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  | 6 |  |  |  |
Asia | 2018 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  |  |  | 10 |  |
Asia | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 5 |
Asia | 2016 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 2
EMEA |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Fixed asset impairment charges | 55 |  |  |  |  |  |
EMEA | 2019 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  | 61 |  |  |  |
EMEA | 2018 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  |  |  | 52 |  |
EMEA | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 34 |
EMEA | 2016 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 298
Americas |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Fixed asset impairment charges | $ 11 |  |  |  |  |  |
Americas | 2019 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  | $ 13 |  |  |  |
Americas | 2018 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs, gross |  |  |  |  | $ 9 |  |
Americas | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | $ 7 |
Americas | 2016 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 32

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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