v3.25.2
Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments     $ (30) $ (12)
Loss on extinguishments of debt $ (10) $ (7) (10) (7)
Loss on disposals of businesses (54) (63) (54) (91)
Midstream & Marketing        
Segment Reporting Information [Line Items]        
Loss on extinguishments of debt 0 (1) 0 (1)
Interest income from intersegment loan 0   0  
Impairment associated with equity method investments   0   0
Costs associated with exit of the UGI International energy marketing business   0   0
Loss on disposals of businesses 0 (62) 0 (62)
AmeriGas operations enhancement for growth project   0   0
Restructuring costs   0   0
Midstream & Marketing | Revenues        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments 1 (1) (1) 0
Costs associated with exit of the UGI International energy marketing business       0
Midstream & Marketing | Cost of sales        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments (59) 26 26 20
Midstream & Marketing | Other operating expense (income), net        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments 0     0
Midstream & Marketing | Other non-operating income (expense), net        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments 0 0 0 0
Midstream & Marketing | Operating and administrative expenses        
Segment Reporting Information [Line Items]        
Costs associated with exit of the UGI International energy marketing business   0    
Midstream & Marketing | Operating and administrative expenses/Other operating expense (income), net        
Segment Reporting Information [Line Items]        
Costs associated with exit of the UGI International energy marketing business       0
UGI International        
Segment Reporting Information [Line Items]        
Loss on extinguishments of debt 0 0 0 0
Interest income from intersegment loan 5   8  
Impairment associated with equity method investments   (25)   (32)
Costs associated with exit of the UGI International energy marketing business   (1)   (29)
Loss on disposals of businesses (54) 0 (54) 0
AmeriGas operations enhancement for growth project   0   0
Restructuring costs   (4)   (38)
UGI International | Revenues        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments 0 0 0 1
Costs associated with exit of the UGI International energy marketing business       (42)
UGI International | Cost of sales        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments (50) 20 (46) 32
UGI International | Other operating expense (income), net        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments (1)     (2)
UGI International | Other non-operating income (expense), net        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments (25) 1 (16) (18)
UGI International | Operating and administrative expenses        
Segment Reporting Information [Line Items]        
Costs associated with exit of the UGI International energy marketing business   (1)    
UGI International | Operating and administrative expenses/Other operating expense (income), net        
Segment Reporting Information [Line Items]        
Costs associated with exit of the UGI International energy marketing business       (11)
AmeriGas Propane        
Segment Reporting Information [Line Items]        
Loss on extinguishments of debt (9) (6) (9) (6)
Interest income from intersegment loan 0   0  
Impairment associated with equity method investments   0   0
Costs associated with exit of the UGI International energy marketing business   0   0
Loss on disposals of businesses 0 0 0 0
AmeriGas operations enhancement for growth project   (12)   (25)
Restructuring costs   (2)   (2)
AmeriGas Propane | Revenues        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments 0 0 0 0
Costs associated with exit of the UGI International energy marketing business       0
AmeriGas Propane | Cost of sales        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments (3) 3 7 31
AmeriGas Propane | Other operating expense (income), net        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments 0     0
AmeriGas Propane | Other non-operating income (expense), net        
Segment Reporting Information [Line Items]        
Net gains (losses) on commodity derivative instruments $ 0 0 $ 0 0
AmeriGas Propane | Operating and administrative expenses        
Segment Reporting Information [Line Items]        
Costs associated with exit of the UGI International energy marketing business   $ 0    
AmeriGas Propane | Operating and administrative expenses/Other operating expense (income), net        
Segment Reporting Information [Line Items]        
Costs associated with exit of the UGI International energy marketing business       $ 0