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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Goodwill [Roll Forward]        
Goodwill     $ 17,920 $ 17,737
Accumulated impairment loss     (1,195) (965)
Beginning Balance   $ 16,725 16,772  
Impairments $ (230)   (230)  
Foreign currency translation and other   (92) 183  
Ending Balance   16,633 16,725 16,772
Transfers   86    
Goodwill impairment loss $ 230   230  
Disposal Group, Held-for-sale, Not Discontinued Operations | Air Distribution Technologies        
Goodwill [Roll Forward]        
Impairments     (21)  
Goodwill impairment loss     21  
Americas        
Goodwill [Roll Forward]        
Goodwill     14,118 14,090
Accumulated impairment loss     (918) (918)
Beginning Balance   13,200 13,172  
Impairments     0  
Foreign currency translation and other   (26) 28  
Ending Balance   13,174 13,200 13,172
Goodwill impairment loss     0  
EMEA        
Goodwill [Roll Forward]        
Goodwill     2,409 2,302
Accumulated impairment loss     (277) (47)
Beginning Balance   2,132 2,255  
Impairments     (230)  
Foreign currency translation and other   (21) 107  
Ending Balance   2,111 2,132 2,255
Goodwill impairment loss     230  
APAC        
Goodwill [Roll Forward]        
Goodwill     1,393 1,345
Accumulated impairment loss     0 0
Beginning Balance   1,393 1,345  
Impairments     0  
Foreign currency translation and other   (45) 48  
Ending Balance   $ 1,348 1,393 $ 1,345
Goodwill impairment loss     $ 0