XML 71 R53.htm IDEA: XBRL DOCUMENT v3.24.3
Summary of Significant Accounting Policies (Details)
$ in Millions
 12 Months Ended
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