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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2023 USD ($) country | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Financial Statement Details [Line Items] |  |  |
Number of countries in which entity operates | country | 150 |  |
Interest percentage minimum for investments in partially owned affiliates to be accounted for by equity method | 20.00% |  |
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 | $ 320 | $ 295 | $ 275
Foreign currency transaction gains (losses) | $ 28 | $ 49 | $ 56
Restricted Stock |  |  |
Financial Statement Details [Line Items] |  |  |
Vesting period | 3 years |  |
Employee Stock Option |  |  |
Financial Statement Details [Line Items] |  |  |
Expiration period for stock options | 10 years |  |
Minimum |  |  |
Financial Statement Details [Line Items] |  |  |
Estimated useful life of dealer intangible assets | 12 years |  |
Minimum | Performance Shares |  |  |
Financial Statement Details [Line Items] |  |  |
Vesting period | 1 year |  |
Minimum | Employee Stock Option |  |  |
Financial Statement Details [Line Items] |  |  |
Vesting period | 2 years |  |
Maximum |  |  |
Financial Statement Details [Line Items] |  |  |
Estimated useful life of dealer intangible assets | 15 years |  |
Maximum | Performance Shares |  |  |
Financial Statement Details [Line Items] |  |  |
Vesting period | 3 years |  |
Maximum | Employee Stock Option |  |  |
Financial Statement Details [Line Items] |  |  |
Vesting period | 3 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 |  |
Subscriber Systems | Maximum |  |  |
Financial Statement Details [Line Items] |  |  |
Estimated useful lives | 15 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 |  |

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