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Significant Restructuring and Impairment Costs (Changes in Company's Restructuring Reserve) (Detail) $ in Millions | 12 Months Ended | 24 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) Plant Employees | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2017 USD ($) Plant Employees
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | $ 367 | $ 288 | $ 215 |
Restructuring reserve, beginning balance | $ 445 |  |  |
Restructuring reserve, ending balance |  | 445 |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees |  |  |  | 6,100
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employees | 1,600 |  |  | 1,600
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant | 10 |  |  |
Number Of Plants Closed | Plant | 4 |  |  | 4
2016 Restructuring Plan [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Schedule of Restructuring Reserve by Type of Cost [Table Text Block] | The following table summarizes the changes in the Company’s 2016 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions):
| Employee Severance and Termination Benefits |  | Long-Lived Asset Impairments |  | Other |  | Currency Translation |  | Total
Original Reserve | $ | 368 |  |  | $ | 190 |  |  | $ | 62 |  |  | $ | — |  |  | $ | 620 |
Acquired Tyco restructuring reserves | 78 |  |  | — |  |  | — |  |  | — |  |  | 78 |
Utilized—cash | (32 | ) |  | — |  |  | — |  |  | — |  |  | (32 | )
Utilized—noncash | — |  |  | (190 | ) |  | (32 | ) |  | 1 |  |  | (221 | )
Balance at September 30, 2016 | $ | 414 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 1 |  |  | $ | 445 |
Adient spin-off impact | (194 | ) |  | — |  |  | (22 | ) |  | — |  |  | (216 | )
Utilized—cash | (86 | ) |  | — |  |  | (2 | ) |  | — |  |  | (88 | )
Utilized—noncash | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Adjustment to restructuring reserves | (25 | ) |  | — |  |  | — |  |  | — |  |  | (25 | )
Transfer to liabilities held for sale | (3 | ) |  | — |  |  | — |  |  | — |  |  | (3 | )
Adjustment to acquired Tyco restructuring reserves | (22 | ) |  | — |  |  | — |  |  | — |  |  | (22 | )
Balance at September 30, 2017 | $ | 84 |  |  | $ | — |  |  | $ | 6 |  |  | $ | 2 |  |  | $ | 92 |
Restructuring and impairment costs |  | 620 |  |
Utilized - cash | $ (88) | (32) |  |
Restructuring Reserve, Settled without Cash | 1 | (221) |  |
Restructuring reserve, ending balance | 92 |  |  | $ 92
Adjustment to restructuring reserves | (25) |  |  |
2016 Restructuring Plan [Member] | Fixed Asset Impairment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  | 190 |  |
Restructuring reserve, beginning balance | 0 |  |  |
Utilized - cash | 0 | 0 |  |
Restructuring Reserve, Settled without Cash | 0 | (190) |  |
Restructuring reserve, ending balance | 0 | 0 |  | 0
Adjustment to restructuring reserves | 0 |  |  |
2016 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  | 62 |  |
Restructuring reserve, beginning balance | 30 |  |  |
Utilized - cash | (2) | 0 |  |
Restructuring Reserve, Settled without Cash | 0 | (32) |  |
Restructuring reserve, ending balance | 6 | 30 |  | 6
Adjustment to restructuring reserves | 0 |  |  |
2016 Restructuring Plan [Member] | Currency Translation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  | 0 |  |
Restructuring reserve, beginning balance | 1 |  |  |
Utilized - cash | 0 | 0 |  |
Restructuring Reserve, Settled without Cash | 1 | 1 |  |
Restructuring reserve, ending balance | 2 | 1 |  | 2
Adjustment to restructuring reserves | 0 |  |  |
2016 Restructuring Plan [Member] | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  | 368 |  |
Restructuring reserve, beginning balance | 414 |  |  |
Utilized - cash | (86) | (32) |  |
Restructuring Reserve, Settled without Cash | 0 | 0 |  |
Restructuring reserve, ending balance | 84 | 414 |  | 84
Adjustment to restructuring reserves | $ (25) |  |  |
2016 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  | 288 |  |
2017 Restructuring Plan [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Schedule of Restructuring Reserve by Type of Cost [Table Text Block] | The following table summarizes the changes in the Company’s 2017 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions):
| Employee Severance and Termination Benefits |  | Long-Lived Asset Impairments |  | Other |  | Currency Translation |  | Total
Original Reserve | $ | 276 |  |  | $ | 77 |  |  | $ | 14 |  |  | $ | — |  |  | $ | 367 |
Utilized—cash | (75 | ) |  | — |  |  | — |  |  | — |  |  | (75 | )
Utilized—noncash | — |  |  | (77 | ) |  | (1 | ) |  | — |  |  | (78 | )
Adjustment to restructuring reserves | 25 |  |  | — |  |  | — |  |  | — |  |  | 25 |
Balance at September 30, 2017 | $ | 226 |  |  | $ | — |  |  | $ | 13 |  |  | $ | — |  |  | $ | 239 |
Restructuring and impairment costs | $ 367 |  |  |
Utilized - cash | (75) |  |  |
Restructuring Reserve, Settled without Cash | (78) |  |  |
Restructuring reserve, ending balance | 239 |  |  | 239
Adjustment to restructuring reserves | 25 |  |  |
2017 Restructuring Plan [Member] | Fixed Asset Impairment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | 77 |  |  |
Utilized - cash | 0 |  |  |
Restructuring Reserve, Settled without Cash | (77) |  |  |
Restructuring reserve, ending balance | 0 |  |  | 0
Adjustment to restructuring reserves | 0 |  |  |
2017 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | 14 |  |  |
Utilized - cash | 0 |  |  |
Restructuring Reserve, Settled without Cash | (1) |  |  |
Restructuring reserve, ending balance | 13 |  |  | 13
Adjustment to restructuring reserves | 0 |  |  |
2017 Restructuring Plan [Member] | Currency Translation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | 0 |  |  |
Utilized - cash | 0 |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |
Restructuring reserve, ending balance | 0 |  |  | 0
Adjustment to restructuring reserves | 0 |  |  |
2017 Restructuring Plan [Member] | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | 276 |  |  |
Utilized - cash | (75) |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |
Restructuring reserve, ending balance | 226 |  |  | $ 226
Adjustment to restructuring reserves | 25 |  |  |
2017 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | 367 |  |  |
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] | 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 |  |  |
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] | Continuing Operations [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  | 56 |  |
Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | $ (166) | (161) | (166) |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees |  |  |  | 1,200
Building Technologies & Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees |  |  |  | 4,800
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant | 10 |  |  |
Power Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | $ (20) | $ (66) | $ (11) |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees |  |  |  | 100
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | (3) |  |  |
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Fixed Asset Impairment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Currency Translation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | (3) |  |  |
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | (216) |  |  |
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Fixed Asset Impairment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | (22) |  |  |
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Currency Translation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | 0 |  |  |
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash | $ (194) |  |  |

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