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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Goodwill [Line Items]    
Goodwill   $ 17,920
Accumulated impairment loss   (1,195)
Goodwill [Roll Forward]    
Balance at beginning of period $ 16,725  
Foreign currency translation (313)  
Balance at end of period 16,412  
Building Solutions North America    
Goodwill [Line Items]    
Goodwill   10,050
Accumulated impairment loss   (659)
Goodwill [Roll Forward]    
Balance at beginning of period 9,391  
Foreign currency translation (41)  
Balance at end of period 9,350  
Building Solutions EMEA/LA    
Goodwill [Line Items]    
Goodwill   2,039
Accumulated impairment loss   (277)
Goodwill [Roll Forward]    
Balance at beginning of period 1,762  
Foreign currency translation (107)  
Balance at end of period 1,655  
Building Solutions Asia Pacific    
Goodwill [Line Items]    
Goodwill   1,227
Accumulated impairment loss   0
Goodwill [Roll Forward]    
Balance at beginning of period 1,227  
Foreign currency translation (84)  
Balance at end of period 1,143  
Global Products    
Goodwill [Line Items]    
Goodwill   4,604
Accumulated impairment loss   $ (259)
Goodwill [Roll Forward]    
Balance at beginning of period 4,345  
Foreign currency translation (81)  
Balance at end of period $ 4,264