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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Goodwill [Line Items]    
Goodwill   $ 18,901
Accumulated impairment loss   (965)
Goodwill [Roll Forward]    
Balance at beginning of period $ 17,936  
Foreign currency translation and other 188  
Balance at end of period 18,124  
Building Solutions North America    
Goodwill [Line Items]    
Goodwill   10,040
Accumulated impairment loss   (659)
Goodwill [Roll Forward]    
Balance at beginning of period 9,381  
Foreign currency translation and other 15  
Balance at end of period 9,396  
Building Solutions EMEA/LA    
Goodwill [Line Items]    
Goodwill   1,932
Accumulated impairment loss   (47)
Goodwill [Roll Forward]    
Balance at beginning of period 1,885  
Foreign currency translation and other 76  
Balance at end of period 1,961  
Building Solutions Asia Pacific    
Goodwill [Line Items]    
Goodwill   1,179
Accumulated impairment loss   0
Goodwill [Roll Forward]    
Balance at beginning of period 1,179  
Foreign currency translation and other 38  
Balance at end of period 1,217  
Global Products    
Goodwill [Line Items]    
Goodwill   5,750
Accumulated impairment loss   $ (259)
Goodwill [Roll Forward]    
Balance at beginning of period 5,491  
Foreign currency translation and other 59  
Balance at end of period $ 5,550