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Revenue from Contracts with Customers - Schedule of Disaggregated Revenues By Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 7,147 | $ 7,045 | $ 8,761
Other revenues | 140 | 165 | 167
Total revenues | 7,287 | 7,210 | 8,928
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (350) | (266) | (323)
Other revenues | 0 | 0 | (3)
Total revenues | (350) | (266) | (326)
Eliminations | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 80 | 49 | 74
Eliminations | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 270 | 217 | 251
Eliminations | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Eliminations | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,736 | 1,552 | 1,816
Other revenues | 25 | 46 | 38
Total revenues | 1,761 | 1,598 | 1,854
Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,483 | 1,368 | 1,845
Other revenues | 0 | 1 | 2
Total revenues | 1,483 | 1,369 | 1,847
Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 2,077 | 2,240 | 2,927
Other revenues | 42 | 39 | 38
Total revenues | 2,119 | 2,279 | 2,965
Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 2,201 | 2,193 | 2,496
Other revenues | 75 | 78 | 85
Total revenues | 2,276 | 2,271 | 2,581
Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | (42) | 0
Other revenues | (2) | 1 | 7
Total revenues | (2) | (41) | 7
Total Utility |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,656 | 1,503 | 1,742
Total Utility | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (80) | (49) | (74)
Total Utility | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,736 | 1,552 | 1,816
Total Utility | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Total Utility | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Total Utility | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Total Utility | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 970 | 873 | 1,020
Residential | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Residential | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 970 | 873 | 1,020
Residential | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Residential | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Residential | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Residential | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Commercial & Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 385 | 344 | 413
Commercial & Industrial | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Commercial & Industrial | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 385 | 344 | 413
Commercial & Industrial | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Commercial & Industrial | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Commercial & Industrial | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Commercial & Industrial | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Large delivery service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 196 | 183 | 177
Large delivery service | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Large delivery service | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 196 | 183 | 177
Large delivery service | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Large delivery service | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Large delivery service | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Large delivery service | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Off-system sales and capacity releases |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 74 | 67 | 89
Off-system sales and capacity releases | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (79) | (48) | (73)
Off-system sales and capacity releases | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 153 | 115 | 162
Off-system sales and capacity releases | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Off-system sales and capacity releases | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Off-system sales and capacity releases | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Off-system sales and capacity releases | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 31 | 36 | 43
Other | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (1) | (1) | (1)
Other | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 32 | 37 | 44
Other | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Total Non-Utility |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 5,491 | 5,542 | 7,019
Total Non-Utility | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (270) | (217) | (249)
Total Non-Utility | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Total Non-Utility | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,483 | 1,368 | 1,845
Total Non-Utility | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 2,077 | 2,240 | 2,927
Total Non-Utility | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 2,201 | 2,193 | 2,496
Total Non-Utility | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | (42) | 0
Retail |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 3,738 | 3,733 | 3,952
Retail | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Retail | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Retail | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Retail | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,785 | 1,816 | 1,768
Retail | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,953 | 1,917 | 2,184
Retail | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Wholesale |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 231 | 270 | 325
Wholesale | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Wholesale | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Wholesale | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Wholesale | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 156 | 180 | 207
Wholesale | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 75 | 90 | 118
Wholesale | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Energy Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 998 | 980 | 2,139
Energy Marketing | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (159) | (96) | (143)
Energy Marketing | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,099 | 948 | 1,410
Energy Marketing | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 58 | 170 | 872
Energy Marketing | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Energy Marketing | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | (42) | 0
Reduction in revenue |  | 42 |
Pipeline |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 225 | 246 | 251
Pipeline | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Pipeline | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Pipeline | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 225 | 246 | 251
Pipeline | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Pipeline | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Pipeline | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Peaking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 27 | 10 | 31
Peaking | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (111) | (121) | (106)
Peaking | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Peaking | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 138 | 131 | 137
Peaking | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Peaking | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Peaking | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 21 | 16 | 14
Other | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 21 | 16 | 14
Other | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Electricity Generation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 27 | 33
Electricity Generation | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 0 | 0
Electricity Generation | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 0 | 0
Electricity Generation | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 27 | 33
Electricity Generation | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 0 | 0
Electricity Generation | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 0 | 0
Electricity Generation | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 0 | 0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 251 | 260 | 274
Other | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 | 0
Other | Operating Segments | UGI International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 78 | 74 | 80
Other | Operating Segments | AmeriGas Propane |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 173 | 186 | 194
Other | Corporate & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 0 | $ 0 | $ 0

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