v3.25.2
Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2025
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 and other (16)  
Balance at end of period 16,709  
Americas    
Goodwill [Line Items]    
Goodwill   14,118
Accumulated impairment loss   (918)
Goodwill [Roll Forward]    
Balance at beginning of period 13,200  
Foreign currency translation and other (3)  
Balance at end of period 13,197  
EMEA    
Goodwill [Line Items]    
Goodwill   2,409
Accumulated impairment loss   (277)
Goodwill [Roll Forward]    
Balance at beginning of period 2,132  
Foreign currency translation and other 23  
Balance at end of period 2,155  
Allocation of goodwill from EMEA to held for sale assets 56  
APAC    
Goodwill [Line Items]    
Goodwill   1,393
Accumulated impairment loss   $ 0
Goodwill [Roll Forward]    
Balance at beginning of period 1,393  
Foreign currency translation and other (36)  
Balance at end of period $ 1,357