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Goodwill and Other Intangible Assets - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
reporting_unit
Sep. 30, 2023
USD ($)
Jul. 31, 2025
USD ($)
asset
Intangible Assets [Line Items]              
Reporting units | reporting_unit         1    
Goodwill $ 16,633   $ 16,725 $ 16,633 $ 16,725 $ 16,772  
Goodwill impairment loss   $ 230     230    
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]   Restructuring and impairment costs          
Number of intangible assets with estimated fair values consistent with carrying values | asset             2
Indefinite-lived trademarks             $ 320
Amortization of intangible assets       439 476 426  
Americas              
Intangible Assets [Line Items]              
Goodwill 13,174   13,200 13,174 13,200 13,172  
Goodwill impairment loss         0    
Amortization of intangible assets       356 379 337  
Americas | Customer relationships              
Intangible Assets [Line Items]              
Impairment of intangible assets, finite-lived 59            
Americas | Technology              
Intangible Assets [Line Items]              
Impairment of intangible assets, finite-lived 16            
EMEA              
Intangible Assets [Line Items]              
Goodwill 2,111   2,132 2,111 2,132 2,255  
Goodwill impairment loss         230    
Amortization of intangible assets       68 $ 80 74  
EMEA | Customer relationships              
Intangible Assets [Line Items]              
Impairment of intangible assets, finite-lived 90            
Global Products Segment              
Intangible Assets [Line Items]              
Impairment of intangible assets, finite-lived     $ 32        
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]     Restructuring and impairment costs        
Building Solutions North America Segment              
Intangible Assets [Line Items]              
Impairment of intangible assets, finite-lived     $ 13        
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]     Restructuring and impairment costs        
Silent-Aire              
Intangible Assets [Line Items]              
Goodwill impairment loss           $ 184  
ADT Mexico Business              
Intangible Assets [Line Items]              
Goodwill $ 174     $ 174