v3.25.2
Segment Information - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Revenues $ 1,394 $ 1,380 $ 6,090 $ 5,968  
Cost of sales 837 639 3,061 2,871  
Operating income (loss) (93) 67 1,094 1,016  
Income (loss) from equity investees 0 (24) 6 (22)  
Loss on extinguishments of debt (10) (7) (10) (7)  
Other non-operating income (expense), net (24) 5 (2) 3  
Earnings (loss) before interest expense and income taxes (127) 41 1,088 990  
Interest expense (101) (96) (305) (296)  
Income (loss) before income taxes (228) (55) 783 694  
Depreciation and amortization 140 139 416 414  
Capital expenditures (including the effects of accruals) 220 211 555 511  
Total assets 15,362 15,066 15,362 15,066 $ 15,098
Midstream & Marketing          
Segment Reporting Information [Line Items]          
Loss on extinguishments of debt 0 (1) 0 (1)  
UGI International          
Segment Reporting Information [Line Items]          
Loss on extinguishments of debt 0 0 0 0  
AmeriGas Propane          
Segment Reporting Information [Line Items]          
Loss on extinguishments of debt (9) (6) (9) (6)  
Eliminations          
Segment Reporting Information [Line Items]          
Revenues (44) (28) (320) (239)  
Cost of sales (44) (28) (320) (239)  
Operating income (loss) (4) 0 (7) 0  
Income (loss) from equity investees   0 0 0  
Loss on extinguishments of debt 0 0 0 0  
Other non-operating income (expense), net 0 0 0 0  
Earnings (loss) before interest expense and income taxes (4) 0 (7) 0  
Interest expense 5 0 8 0  
Income (loss) before income taxes 1 0 1 0  
Depreciation and amortization 0 0 0 0  
Capital expenditures (including the effects of accruals) 0 0 0 0  
Total assets (381) (143) (381) (143)  
Eliminations | Utilities          
Segment Reporting Information [Line Items]          
Revenues 12 7 73 43  
Eliminations | Midstream & Marketing          
Segment Reporting Information [Line Items]          
Revenues 32 22 247 197  
Eliminations | UGI International          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Eliminations | AmeriGas Propane          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Operating Segments | Utilities          
Segment Reporting Information [Line Items]          
Revenues 287 257 1,545 1,396  
Revenues from external customers 275 250 1,472 1,353  
Cost of sales 115 89 697 584  
Operating income (loss) 29 37 407 396  
Income (loss) from equity investees   0 0 0  
Loss on extinguishments of debt 0 0 0 0  
Other non-operating income (expense), net 1 2 5 4  
Earnings (loss) before interest expense and income taxes 30 39 412 400  
Interest expense (24) (22) (75) (69)  
Income (loss) before income taxes 6 17 337 331  
Depreciation and amortization 44 42 132 124  
Capital expenditures (including the effects of accruals) 146 126 352 299  
Total assets 6,228 5,792 6,228 5,792  
Operating Segments | Midstream & Marketing          
Segment Reporting Information [Line Items]          
Revenues 278 253 1,232 1,130  
Revenues from external customers 246 231 985 933  
Cost of sales 201 167 815 689  
Operating income (loss) 27 41 269 291  
Income (loss) from equity investees   2 7 7  
Loss on extinguishments of debt 0 0 0 0  
Other non-operating income (expense), net 0 0 0 0  
Earnings (loss) before interest expense and income taxes 27 43 276 298  
Interest expense (11) (9) (35) (29)  
Income (loss) before income taxes 16 34 241 269  
Depreciation and amortization 20 22 60 66  
Capital expenditures (including the effects of accruals) 30 40 89 92  
Total assets 3,188 3,182 3,188 3,182  
Operating Segments | UGI International          
Segment Reporting Information [Line Items]          
Revenues 437 455 1,725 1,853  
Cost of sales 245 244 967 1,058  
Operating income (loss) 43 57 288 294  
Income (loss) from equity investees   (1) (1) (4)  
Loss on extinguishments of debt 0 0 0 0  
Other non-operating income (expense), net 0 1 9 15  
Earnings (loss) before interest expense and income taxes 43 57 296 305  
Interest expense (13) (11) (34) (33)  
Income (loss) before income taxes 30 46 262 272  
Depreciation and amortization 31 29 89 88  
Capital expenditures (including the effects of accruals) 24 24 55 55  
Total assets 3,191 2,807 3,191 2,807  
Operating Segments | AmeriGas Propane          
Segment Reporting Information [Line Items]          
Revenues 434 445 1,909 1,869  
Cost of sales 207 217 889 862  
Operating income (loss) (28) (27) 200 182  
Income (loss) from equity investees   0 0 0  
Loss on extinguishments of debt 0 0 0 0  
Other non-operating income (expense), net 0 0 0 0  
Earnings (loss) before interest expense and income taxes (28) (27) 200 182  
Interest expense (36) (41) (106) (122)  
Income (loss) before income taxes (64) (68) 94 60  
Depreciation and amortization 45 46 135 134  
Capital expenditures (including the effects of accruals) 20 21 59 65  
Total assets 2,964 3,228 2,964 3,228  
Corporate & Other          
Segment Reporting Information [Line Items]          
Revenues from external customers 2 (1) (1) (40)  
Cost of sales 113 (50) 13 (83)  
Operating income (loss) (160) (41) (63) (147)  
Income (loss) from equity investees   (25) 0 (25)  
Loss on extinguishments of debt (10) (7) (10) (7)  
Other non-operating income (expense), net (25) 2 (16) (16)  
Earnings (loss) before interest expense and income taxes (195) (71) (89) (195)  
Interest expense (22) (13) (63) (43)  
Income (loss) before income taxes (217) (84) (152) (238)  
Depreciation and amortization 0 0 0 2  
Capital expenditures (including the effects of accruals) 0 0 0 0  
Total assets 172 200 172 200  
Intersegment revenues Corporate & Other          
Segment Reporting Information [Line Items]          
Revenues $ 0 $ (1) $ 0 $ (1)