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Summary of Significant Accounting Policies Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Financial Statement Details [Line Items] |  |  |  |
Number of Countries in which Entity Operates | 150 |  |  |
Restricted Cash and Investments, Current | $ 6 | $ 9 |  |
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 | $ 275 | 274 | $ 319 |
Foreign currency transaction gains (losses) | $ 56 | $ (32) | (10) |
Minimum |  |  |  |
Financial Statement Details [Line Items] |  |  |  |
Estimated useful life of dealer intangible assets | 12 years |  |  |
Maximum |  |  |  |
Financial Statement Details [Line Items] |  |  |  |
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 |  |  |
Power Solutions |  |  |  |
Financial Statement Details [Line Items] |  |  |  |
Disposal Group, Discontinued Operations, Consideration, net |  |  | $ 11,600 | $ 11,600

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