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Summary of Significant Accounting Policies Accounting Policies (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) Segment $ / shares | Jun. 30, 2017 Segment | Sep. 30, 2017 USD ($) Segment $ / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) | Oct. 31, 2016 shares | Sep. 02, 2016 $ / shares
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Maturity period to be considered cash equivalents |  |  | 3 months |  |  |  |
Restricted Cash and Cash Equivalents | $ 31 |  | $ 31 | $ 88 |  |  |
Restricted Cash and Investments, Current | 22 |  | 22 | 79 |  |  |
Restricted Cash and Cash Equivalents, Noncurrent | 9 |  | 9 | 9 |  |  |
Costs and earnings in excess of billings related to contracts | 908 |  | 908 | 841 |  |  |
Billing in excess of costs and earnings on uncompleted contracts | 451 |  | 451 | 431 |  |  |
Liability for Asbestos and Environmental Claims, Gross | $ 573 |  | $ 573 | 548 |  |  |
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 |  |  | $ 360 | 158 | $ 134 |  |
Foreign currency transaction gains (losses) |  |  | $ 94 | $ (95) | $ (119) |  |
Number of reportable segments | Segment | 4 | 5 | 5 |  |  |  |
Adient shares received per 10 shares of Johnson Controls shares | shares |  |  |  |  |  | 1 |
Ordinary shares, par value | $ / shares | $ 0.01 |  | $ 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 |  |  |  |
Maximum |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Duration of extended warranty arrangements |  |  | 5 years |  |  |  |
Estimated useful life of dealer intangible assets |  |  | 15 years |  |  |  |
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 |  |  |  |
Johnson Controls International plc [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  | $ 1,500 |  |  |  |
Adient |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  | $ 500 |  |  |  |
Tyco Merger [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  | $ 1.00

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