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Income Taxes Other Tax Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ 139 |  |  | $ 101 |  |  |  |
Nondeductible expense related to restructuring and impairment |  |  |  |  |  | $ (5) | $ (17) | $ 28
Income tax provision |  |  |  |  |  | 518 | 705 | 197
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  | $ 53 |  |  | 31 | (164) | (29)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  |  |  | 10 | 420 | (393)
Restructuring and impairment costs |  |  |  |  |  | 263 | 367 | 288
Post sale contingent tax indemnification liabilities | 255 |  | $ 290 |  | $ 290 | 255 | 290 | 290
Impact of acquisitions and divestitures |  |  |  |  |  | 145 | 475 | 163
Power Solutions |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Impact of acquisitions and divestitures | 129 |  |  |  |  |  |  |
Scott Safety business [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on divestiture |  | $ 114 |  |  |  |  |  |
Income tax expense from disposal |  | 30 |  |  |  |  |  |
Impact of acquisitions and divestitures |  |  |  |  |  |  | (490) |
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax |  | $ 84 |  |  |  |  |  |
Business Divestitures, Not Specific |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Post sale contingent tax indemnification liabilities | $ 235 |  |  |  |  | 235 |  |
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 |  |  |  |  |  | 234 | 428 |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  |  |  | 27 | 69 |
2018 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  |  | 38 |  |
2017 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  |  |  | 63 |
2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  |  |  |  | 76
Adient spin-off [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  |  |  |  | 26
Pension mark-to-market [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  |  |  | $ (3) | $ 126 | $ (119)
Tyco merger [Member] |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  | $ 137 |  |  |

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