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Goodwill and Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Goodwill      
Balance at beginning of period $ 2,871 $ 3,027  
Impairment of goodwill 0 (195) $ (656)
Dispositions (67) (12)  
Foreign currency translation 48 51  
Balance at end of period 2,852 2,871 3,027
Utilities      
Goodwill      
Balance at beginning of period 432 432  
Impairment of goodwill   0  
Dispositions 0 0  
Foreign currency translation 0 0  
Balance at end of period 432 432 432
Midstream & Marketing      
Goodwill      
Balance at beginning of period 336 336  
Impairment of goodwill   0 0
Dispositions 0 0  
Foreign currency translation 0 0  
Balance at end of period 336 336 336
UGI International      
Goodwill      
Balance at beginning of period 950 911  
Impairment of goodwill   0 0
Dispositions (41) (12)  
Foreign currency translation 48 51  
Balance at end of period 957 950 911
AmeriGas Propane      
Goodwill      
Balance at beginning of period 1,153 1,348  
Impairment of goodwill   (195) (656)
Dispositions (26) 0  
Foreign currency translation 0 0  
Balance at end of period $ 1,127 $ 1,153 $ 1,348