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v3.25.3

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Jul. 31, 2024
Financial Statement Details [Line Items] |  |  |  |
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 | $ 273 | $ 267 | $ 251 |
Foreign currency transaction (losses) gains | $ (95) | (10) | $ 22 |
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities | 1 year |  |  |
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities | 1 year |  |  |
Accrual for best estimate of the probable loss on certain tax positions | $ 1,900 |  |  |
Accounts payable included in SCF programs | $ 835 | $ 703 |  |
Supplier Finance Program, Obligation, Current, 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% |  |  | 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% |  |  | 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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