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Equity-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 29, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award        
Pre-tax equity-based compensation expense   $ 21 $ 15 $ 18
After tax equity-based compensation expense   $ 15 $ 11 $ 13
Weighted-average fair value of stock option granted under stock plans (in dollars per share)   $ 6.05 $ 5.58 $ 8.70
Options outstanding (in shares)   10,204,836    
Options exercisable (in shares)   7,445,827    
Weighted average exercise price (in dollars per share)   $ 38.42    
UGI Stock Option Awards        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation cost associated with unvested unit awards   $ 7    
Weighted-average period of recognition for unvested unit awards   2 years    
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)   $ 41.41 $ 41.47 $ 55.40
Award performance period   3 years    
UGI Performance Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
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        
Percentage of target award to be granted (as a percentage)   200.00%    
UGI Performance Units and Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation cost associated with unvested unit awards   $ 19    
Weighted-average period of recognition for unvested unit awards   1 year 10 months 24 days    
UGI Unit awards outstanding (in shares)   1,124,369    
Weighted average grant date fair value, outstanding (in dollars per share)   $ 33.41    
Common Stock | 2021 IAP        
Share-based Compensation Arrangement by Share-based Payment Award        
Common Stock awards granted (up to) 20,500,000      
Number of common unit awards available for future grant (in shares)   20,037,430    
Expiration period 10 years