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Significant Restructuring Costs Change in Restructuring Reserve - 2016 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | $ 0 | $ 158 | $ 99 | $ 78 | $ 158 | $ 177 |  |
2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 288
Committed restructuring liabilities assumed from Tyco Merger [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | 56 |  |  |  |  |  |  | 78
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | $ (22) |
2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 620
Payments for Restructuring |  |  |  |  | (16) |  | (88) | (32)
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 1 | (221)
Adjustment to restructuring reserves |  |  |  |  |  |  | (25) |
Restructuring Reserve | 76 |  |  |  | 76 |  | 92 | 445
Employee Severance | 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) |
Employee Severance | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 368
Payments for Restructuring |  |  |  |  | (14) |  | (86) | (32)
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 | 0
Adjustment to restructuring reserves |  |  |  |  |  |  | (25) |
Restructuring Reserve | 70 |  |  |  | 70 |  | 84 | 414
Fixed Asset Impairment | Committed restructuring liabilities assumed from Tyco Merger [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 0
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 |
Fixed Asset Impairment | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 190
Payments for Restructuring |  |  |  |  | 0 |  | 0 | 0
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 | (190)
Adjustment to restructuring reserves |  |  |  |  |  |  | 0 |
Restructuring Reserve | 0 |  |  |  | 0 |  | 0 | 0
Other Restructuring | Committed restructuring liabilities assumed from Tyco Merger [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 0
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 |
Other Restructuring | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 62
Payments for Restructuring |  |  |  |  | (2) |  | (2) | 0
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 | (32)
Adjustment to restructuring reserves |  |  |  |  |  |  | 0 |
Restructuring Reserve | 4 |  |  |  | 4 |  | 6 | 30
Currency Translation | Committed restructuring liabilities assumed from Tyco Merger [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 0
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 |
Currency Translation | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 0
Payments for Restructuring |  |  |  |  | 0 |  | 0 | 0
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 1 | 1
Adjustment to restructuring reserves |  |  |  |  |  |  | 0 |
Restructuring Reserve | $ 2 |  |  |  | $ 2 |  | 2 | 1
Building Solutions EMEA/LA | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 17
Corporate Segment | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 161
Power Solutions | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 66
Adient spin-off [Member] | Transfer To Held for Sale [Member] | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | (216) |
Adient spin-off [Member] | Transfer To Held for Sale [Member] | Employee Severance | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | (194) |
Adient spin-off [Member] | Transfer To Held for Sale [Member] | Fixed Asset Impairment | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 |
Adient spin-off [Member] | Transfer To Held for Sale [Member] | Other Restructuring | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | (22) |
Adient spin-off [Member] | Transfer To Held for Sale [Member] | Currency Translation | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 |
Scott Safety business [Member] | Transfer To Held for Sale [Member] | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | (3) |
Scott Safety business [Member] | Transfer To Held for Sale [Member] | Employee Severance | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | (3) |
Scott Safety business [Member] | Transfer To Held for Sale [Member] | Fixed Asset Impairment | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 |
Scott Safety business [Member] | Transfer To Held for Sale [Member] | Other Restructuring | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0 |
Scott Safety business [Member] | Transfer To Held for Sale [Member] | Currency Translation | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | $ 0 |
Adient | Discontinued Operations | 2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 332

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