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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2024 USD ($) country | Sep. 30, 2023 USD ($) | Sep. 30, 2022 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% |  |
Allowance for expected credit losses | $ 210 | $ 88 |
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 | $ 267 | 251 | $ 236
Foreign currency transaction gains (losses) | $ (10) | 22 | $ 33
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities | 1 year |  |
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities | 1 year |  |
Accounts payable included in SCF programs | $ 703 | $ 520 |
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] | Accounts payable | Accounts payable |
Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd |  |  |
Financial Statement Details [Line Items] |  |  |
Joint venture ownership | 60.00% |  |
Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd | Hitachi Global Life Solutions, Inc. |  |  |
Financial Statement Details [Line Items] |  |  |
Joint venture ownership | 40.00% |  |
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] |  |  |
Extended warranty arrangement duration | 1 year |  |
Deliverable period | 4 months |  |
Estimated useful life of dealer intangible assets | 12 years |  |
Negotiated commercial terms | 90 days |  |
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] |  |  |
Extended warranty arrangement duration | 5 years |  |
Deliverable period | 24 months |  |
Estimated useful life of dealer intangible assets | 15 years |  |
Negotiated commercial terms | 120 days |  |
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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