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Significant Restructuring and Impairment Costs (Detail) $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) Plant Employees | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2018 USD ($) Employees
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs | $ 235 | $ 255 | $ 347 |  |
Restructuring Reserve |  |  |  | $ 445 |
Number of employees to be severed | Employees |  |  |  |  | 11,300
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employees | 6,200 |  |  |  |
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant | 12 |  |  |  |
Number Of Plants Closed | Plant | 11 |  |  |  |
Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of employees to be severed | Employees |  |  |  |  | 9,100
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant | 12 |  |  |  |
Corporate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 50 | 166 |  |
Number of employees to be severed | Employees |  |  |  |  | 2,200
2017 Restructuring Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 367 |  |
Payments for Restructuring | $ (13) | (158) | (75) |  |
Restructuring Reserve, Settled without Cash | (3) | (1) | (78) |  |
Adjustment to restructuring reserves |  |  | 25 |  |
Restructuring Reserve | 61 | 80 | 239 |  | $ 80
2017 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 347 |  |
2017 Restructuring Plan [Member] | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 276 |  |
Payments for Restructuring | (11) | (152) | (75) |  |
Restructuring Reserve, Settled without Cash | 0 | 0 | 0 |  |
Adjustment to restructuring reserves |  |  | 25 |  |
Restructuring Reserve | 60 | 74 | 226 |  | 74
2017 Restructuring Plan [Member] | Fixed Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 77 |  |
Payments for Restructuring | 0 | 0 | 0 |  |
Restructuring Reserve, Settled without Cash | 0 | 0 | (77) |  |
Adjustment to restructuring reserves |  |  | 0 |  |
Restructuring Reserve | 0 | 0 | 0 |  | 0
2017 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 14 |  |
Payments for Restructuring | (2) | (6) | 0 |  |
Restructuring Reserve, Settled without Cash | 0 | 0 | (1) |  |
Adjustment to restructuring reserves |  |  | 0 |  |
Restructuring Reserve | 5 | 7 | 13 |  | 7
2017 Restructuring Plan [Member] | Currency Translation |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 0 |  |
Payments for Restructuring | 0 | 0 | 0 |  |
Restructuring Reserve, Settled without Cash | (3) | (1) | 0 |  |
Adjustment to restructuring reserves |  |  | 0 |  |
Restructuring Reserve | (4) | (1) | 0 |  | (1)
2017 Restructuring Plan [Member] | Power Solutions | Discontinued Operations |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 20 |  |
2017 Restructuring Plan [Member] | Power Solutions | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | (3) |  |  |  |
2017 Restructuring Plan [Member] | Power Solutions | Employee Severance | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | (3) |  |  |  |
2017 Restructuring Plan [Member] | Power Solutions | Fixed Asset Impairment | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |  |
2017 Restructuring Plan [Member] | Power Solutions | Other Restructuring [Member] | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |  |
2017 Restructuring Plan [Member] | Power Solutions | Currency Translation | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |  |
2018 Restructuring Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 263 |  |  |
Payments for Restructuring | (67) | (47) |  |  |
Restructuring Reserve, Settled without Cash | (1) | (42) |  |  |
Restructuring Reserve | 102 | 174 |  |  | 174
2018 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 255 |  |  |
2018 Restructuring Plan [Member] | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 209 |  |  |
Payments for Restructuring | (61) | (45) |  |  |
Restructuring Reserve, Settled without Cash | 0 | 0 |  |  |
Restructuring Reserve | 99 | 164 |  |  | 164
2018 Restructuring Plan [Member] | Fixed Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 42 |  |  |
Payments for Restructuring | 0 | 0 |  |  |
Restructuring Reserve, Settled without Cash | 0 | (42) |  |  |
Restructuring Reserve | 0 | 0 |  |  | 0
2018 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 12 |  |  |
Payments for Restructuring | (6) | (2) |  |  |
Restructuring Reserve, Settled without Cash | 0 | 0 |  |  |
Restructuring Reserve | 4 | 10 |  |  | 10
2018 Restructuring Plan [Member] | Currency Translation |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 0 |  |  |
Payments for Restructuring | 0 |  |  |  |
Restructuring Reserve, Settled without Cash | (1) | 0 |  |  |
Restructuring Reserve | (1) | 0 |  |  | 0
2018 Restructuring Plan [Member] | Power Solutions | Discontinued Operations |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 8 |  |  |
2018 Restructuring Plan [Member] | Power Solutions | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | (4) |  |  |  |
2018 Restructuring Plan [Member] | Power Solutions | Employee Severance | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | (4) |  |  |  |
2018 Restructuring Plan [Member] | Power Solutions | Fixed Asset Impairment | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |  |
2018 Restructuring Plan [Member] | Power Solutions | Other Restructuring [Member] | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |  |
2018 Restructuring Plan [Member] | Power Solutions | Currency Translation | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash | 0 | 0 |  |  |
2016 Restructuring Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 620 |
Payments for Restructuring | (41) | (19) | (88) | (32) |
Restructuring Reserve, Settled without Cash |  |  | 1 | (221) |
Adjustment to restructuring reserves |  |  | (25) |  |
Restructuring Reserve | 32 | 73 | 92 |  | 73
2016 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 222 |
2016 Restructuring Plan [Member] | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 368 |
Payments for Restructuring | (37) | (17) | (86) | (32) |
Restructuring Reserve, Settled without Cash |  |  | 0 | 0 |
Adjustment to restructuring reserves |  |  | (25) |  |
Restructuring Reserve | 30 | 67 | 84 | 414 | 67
2016 Restructuring Plan [Member] | Fixed Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 190 |
Payments for Restructuring | 0 | 0 | 0 | 0 |
Restructuring Reserve, Settled without Cash |  |  | 0 | (190) |
Adjustment to restructuring reserves |  |  | 0 |  |
Restructuring Reserve | 0 | 0 | 0 | 0 | 0
2016 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 62 |
Payments for Restructuring | (4) | (2) | (2) | 0 |
Restructuring Reserve, Settled without Cash |  |  | 0 | (32) |
Adjustment to restructuring reserves |  |  | 0 |  |
Restructuring Reserve | 0 | 4 | 6 | 30 | 4
2016 Restructuring Plan [Member] | Currency Translation |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 0 |
Payments for Restructuring | 0 | 0 | 0 | 0 |
Restructuring Reserve, Settled without Cash |  |  | 1 | 1 |
Adjustment to restructuring reserves |  |  | 0 |  |
Restructuring Reserve | 2 | 2 | 2 | 1 | $ 2
2016 Restructuring Plan [Member] | Adient | Discontinued Operations |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 398 |
2016 Restructuring Plan [Member] | Adient spin-off [Member] | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (216) |  |
2016 Restructuring Plan [Member] | Adient spin-off [Member] | Employee Severance | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (194) |  |
2016 Restructuring Plan [Member] | Adient spin-off [Member] | Fixed Asset Impairment | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
2016 Restructuring Plan [Member] | Adient spin-off [Member] | Other Restructuring [Member] | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (22) |  |
2016 Restructuring Plan [Member] | Adient spin-off [Member] | Currency Translation | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
2016 Restructuring Plan [Member] | Scott Safety business [Member] | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (3) |  |
2016 Restructuring Plan [Member] | Scott Safety business [Member] | Employee Severance | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (3) |  |
2016 Restructuring Plan [Member] | Scott Safety business [Member] | Fixed Asset Impairment | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
2016 Restructuring Plan [Member] | Scott Safety business [Member] | Other Restructuring [Member] | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
2016 Restructuring Plan [Member] | Scott Safety business [Member] | Currency Translation | Transfer To Held for Sale [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
Committed restructuring liabilities assumed from Tyco Merger [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 78 |
Restructuring Reserve, Settled without Cash |  |  | (22) |  |
Committed restructuring liabilities assumed from Tyco Merger [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 56 |
Committed restructuring liabilities assumed from Tyco Merger [Member] | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 78 |
Restructuring Reserve, Settled without Cash |  |  | (22) |  |
Committed restructuring liabilities assumed from Tyco Merger [Member] | Fixed Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 0 |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
Committed restructuring liabilities assumed from Tyco Merger [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 0 |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
Committed restructuring liabilities assumed from Tyco Merger [Member] | Currency Translation |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 0 |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
Building Solutions Asia Pacific | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 16 | 16 |  |
Building Solutions Asia Pacific | 2017 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 16 |  |
Building Solutions Asia Pacific | 2018 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 16 |  |  |
Corporate | 2017 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 166 |  |
Corporate | 2018 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 50 |  |  |
Corporate | 2016 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 161 |
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 56 | 74 |  |
Building Solutions EMEA/LA | 2017 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 74 |  |
Building Solutions EMEA/LA | 2018 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 56 |  |  |
Building Solutions EMEA/LA | 2016 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | 17 |
Building Solutions North America | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 20 | 59 |  |
Building Solutions North America | 2017 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 59 |  |
Building Solutions North America | 2018 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 20 |  |  |
Global Products | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs | $ 235 | 113 | 32 |  |
Global Products | 2017 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | $ 32 |  |
Global Products | 2018 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | $ 113 |  |  |
Global Products | 2016 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  |  | $ 44 |

X
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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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