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Restructuring and Impairment Costs - Changes in Reserve (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | $ 141 |
Noncash adjustment—underspend |  | $ (7)
Restructuring Reserve Ending Balance | 140 | 141
2019 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Noncash adjustment—underspend | 8 |
2018 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 48 |
Utilized—cash | (16) |
Utilized—noncash | 0 |
Noncash adjustment—underspend | 2 |
Restructuring Reserve Ending Balance | 30 | 48
2016 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 75 |
Utilized—cash | (37) |
Utilized—noncash | (2) |
Noncash adjustment—underspend |  | (20)
Restructuring Reserve Ending Balance | 36 | 75
Employee Severance and Termination Benefits | 2019 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 80 |
Utilized—cash | (13) |
Restructuring Reserve Ending Balance | 67 | 80
Employee Severance and Termination Benefits | 2018 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 49 |
Utilized—cash | (16) |
Utilized—noncash | 0 |
Noncash adjustment—underspend | 2 |
Restructuring Reserve Ending Balance | 31 | 49
Employee Severance and Termination Benefits | 2017 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 12 |
Utilized—cash | (2) |
Utilized—noncash | (1) |
Noncash adjustment—underspend |  | (6)
Restructuring Reserve Ending Balance | 3 | 12
Employee Severance and Termination Benefits | 2016 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 71 |
Utilized—cash | (37) |
Utilized—noncash | 0 |
Noncash adjustment—underspend |  | (20)
Restructuring Reserve Ending Balance | 34 | 71
Other | 2018 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 1 |
Utilized—cash | 0 |
Utilized—noncash | (1) |
Noncash adjustment—underspend | 0 |
Restructuring Reserve Ending Balance | 0 | 1
Currency Translation | 2018 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | (2) |
Utilized—cash | 0 |
Utilized—noncash | 1 |
Noncash adjustment—underspend | 0 |
Restructuring Reserve Ending Balance | (1) | (2)
Currency Translation | 2016 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring Reserve Beginning Balance | 4 |
Utilized—cash | 0 |
Utilized—noncash | (2) |
Restructuring Reserve Ending Balance | $ 2 | $ 4

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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