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Income Taxes Other Tax Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Nondeductible expense related to restructuring and impairment |  |  |  |  |  | $ 65 | $ 28 | $ 0
Income tax provision |  |  |  |  |  | 705 | 197 | 71
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 53 |  |  |  |  | 34 | (29) | (7)
Restructuring and impairment costs |  |  |  |  |  | 367 | 288 | 215
Post sale contingent tax indemnification liabilities | 290 |  | $ 290 |  |  | 290 | 290 |
Tax indemnification liabilities related to other divestitures | 11 |  |  |  |  | 11 |  |
Scott Safety business [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  |  |  | 490 |  |
Business Divestitures, Not Specific |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Post sale contingent tax indemnification liabilities | 255 |  |  |  |  | 255 |  |
(Loss) on divestiture | $ (9) |  | (12) |  |  |  |  | (10)
Global Workplace Solutions |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  |  |  |  |  | 680
Discontinued Operation, Income from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  | $ (1,203)
Automotive Experience Interiors | Yanfeng Automotive Trim Systems [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Discontinued Operation, Income from Discontinued Operation, before Income Tax |  |  |  | $ (145) |  |  |  |
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax |  |  |  | 38 |  |  |  |
Automotive Experience Interiors | Interiors |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  | $ 223 | $ 75 |  |  |
2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 620 |
Transaction and integration costs [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  | 428 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  |  |  | $ 69 |  |
Tyco Merger [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income tax provision |  |  | $ 137 |  |  |  |  |
Adient spin-off [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income tax provision |  | $ 26 |  |  |  |  |  |
Change in Entity Status [Domain] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | $ 101 |  |  |  |  |  |

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