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Equity-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 29, 2021
Jan. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award          
Pre-tax equity-based compensation expense     $ 8 $ 17 $ 15
After tax equity-based compensation expense     $ 6 $ 13 $ 11
Weighted-average fair value of stock option granted under stock plans (in dollars per share)     $ 4.17 $ 9.31 $ 8.47
Options outstanding (in shares)     8,154,066    
Options exercisable (in shares)     7,127,891    
Weighted average exercise price (in dollars per share)     $ 42.94    
UGI Stock Option Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation cost associated with unvested unit awards     $ 2    
Weighted-average period of recognition for unvested unit awards     1 year 9 months 18 days    
UGI Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Weighted-average fair value of stock option granted under stock plans (in dollars per share)     $ 28.91 $ 44.62 $ 51.24
UGI Performance Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Award performance period     0 years    
Percentage of target award to be granted (as a percentage)     0.00%    
UGI Performance Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Award performance period     3 years    
Percentage of target award to be granted (as a percentage)     200.00%    
UGI EPS Performance Unit          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation cost associated with unvested unit awards     $ 14    
Weighted-average period of recognition for unvested unit awards     1 year 8 months 12 days    
UGI Unit awards outstanding (in shares)     1,223,190    
Weighted average grant date fair value, outstanding (in dollars per share)     $ 36.16    
UGI EPS Performance Unit | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Award performance period   0 years      
Percentage of target award to be granted (as a percentage)   0.00%      
UGI EPS Performance Unit | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Award performance period   3 years      
Percentage of target award to be granted (as a percentage)   200.00%      
2021 IAP | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Common Stock awards granted (up to) (in shares) 20,500,000        
Expiration period 10 years        
Number of common unit awards available for future grant (in shares)     15,293,516