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Summary of Significant Accounting Policies Accounting Policies (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) Segment $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) | Oct. 31, 2016 shares | Sep. 02, 2016 $ / shares
Financial Statement Details [Line Items] |  |  |  |  |  |
Number Of Vies In Which Company Was Not Primary Beneficiary |  | 3 | 2 |  |  |
Cash in escrow related to Adient debt |  |  |  | $ 2,000 |  |
Deferred tax asset from stock options exercised and restricted stock vestings | $ 179 |  |  |  |  |
Number of Countries in which Entity Operates |  | 150 |  |  |  |
Maturity period to be considered cash equivalents |  | 3 months |  |  |  |
Restricted Cash and Cash Equivalents |  | $ 15 | $ 31 |  |  |
Restricted Cash and Investments, Current |  | 6 | 22 |  |  |
Restricted Cash and Cash Equivalents, Noncurrent |  | 9 | 9 |  |  |
Costs and earnings in excess of billings related to contracts |  | 1,054 | 908 |  |  |
Billing in excess of costs and earnings on uncompleted contracts |  | 535 | 451 |  |  |
Liability for Asbestos and Environmental Claims, Gross |  | $ 550 | 573 |  |  |
Timing of the first deliverable to the last delivery |  | Approximately four to twelve months |  |  |  |
Pooled subscriber assets and related deferred revenue, useful life |  | 12 years |  |  |  |
Non-pooled subscriber assets and related deferred revenue, useful life |  | 15 years |  |  |  |
Standard chargeback period from dealer for monitoring service cancellations |  | 6 months |  |  |  |
Non-standard chargeback period from dealer for monitoring service cancellations |  | 12 months |  |  |  |
Research and Development Expense |  | $ 380 | 360 | 158 |  |
Foreign currency transaction gains (losses) |  | $ (5) | $ 94 | (95) |  |
Number of reportable segments | Segment |  | 5 |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  |  | $ 2,000 |  |
Adient shares received per 10 shares of Johnson Controls shares | shares |  |  |  |  | 1 |
Ordinary shares, par value | $ / shares |  | $ 0.01 | $ 0.01 |  |  | $ 1.00
Johnson Controls shares converted into one share of Adient | shares |  |  |  |  | 10 |
Minimum |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Duration of extended warranty arrangements |  | 1 year |  |  |  |
Estimated useful life of dealer intangible assets |  | 12 years |  |  |  |
New Accounting Pronouncement, Effect of Change on Net Revenue, Percent |  | 10.00% |  |  |  |
Maximum |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Duration of extended warranty arrangements |  | 5 years |  |  |  |
Estimated useful life of dealer intangible assets |  | 15 years |  |  |  |
New Accounting Pronouncement, Effect of Change on Net Revenue, Percent |  | 15.00% |  |  |  |
Building And Improvements | Minimum |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |  |
Building And Improvements | Maximum |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Estimated useful lives |  | 40 years |  |  |  |
Machinery and Equipment | Minimum |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |  |
Machinery and Equipment | Maximum |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Estimated useful lives |  | 15 years |  |  |  |
Tyco merger [Member] |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  | $ 1.00
ASU2016-16 [Member] |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
New Accounting Pronouncement 2016-16, Effect of Change on Retained Earnings |  | $ 550 |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |
New Accounting Pronouncement 2016-16, Effect of Change on Retained Earnings |  | $ 35 |  |  |  |

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