v3.26.1
Segment Information - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Segment Reporting [Line Items]          
Revenues from external customers $ 1,331 $ 1,394 $ 6,099 $ 6,090  
Intersegment revenues 1,331 1,394 6,099 6,090  
Cost of sales 758 837 2,957 3,061  
Operating and administrative expenses 491 481 1,570 1,524  
Depreciation and amortization 138 140 416 416  
Income (loss) from equity investees (1) 0 8 6  
Other segment income (loss) 5 (63) 17 (7)  
Earnings (loss) before interest expense and income taxes (52) (127) 1,181 1,088  
Interest expense (109) (101) (331) (305)  
Income tax benefit (expense) 28 65 (166) (92)  
Net income (loss) attributable to UGI (133) (163) 684 691  
Capital expenditures (including the effects of accruals) 219 220 590 555  
Total assets 15,631 15,362 15,631 15,362 $ 15,462
Utilities          
Segment Reporting [Line Items]          
Segment expense 96 96 307 290  
Eliminations          
Segment Reporting [Line Items]          
Revenues from external customers 0 0 0 0  
Intersegment revenues (28) (44) (428) (320)  
Cost of sales (28) (44) (428) (320)  
Operating and administrative expenses (25) (24) (76) (75)  
Depreciation and amortization 0 0 0 0  
Income (loss) from equity investees 0   0 0  
Other segment income (loss) (28) (28) (86) (82)  
Earnings (loss) before interest expense and income taxes (3) (4) (10) (7)  
Interest expense 3 5 10 8  
Income tax benefit (expense) 0 0 0 0  
Net income (loss) attributable to UGI 0 1 0 1  
Capital expenditures (including the effects of accruals) 0 0 0 0  
Total assets (169) (381) (169) (381)  
Eliminations | Utilities          
Segment Reporting [Line Items]          
Intersegment revenues 3 12 88 73  
Eliminations | Midstream & Marketing          
Segment Reporting [Line Items]          
Intersegment revenues 25 32 340 247  
Eliminations | UGI International          
Segment Reporting [Line Items]          
Intersegment revenues 0 0 0 0  
Eliminations | AmeriGas Propane          
Segment Reporting [Line Items]          
Intersegment revenues 0 0 0 0  
Operating Segments | Utilities          
Segment Reporting [Line Items]          
Revenues from external customers 299 275 1,685 1,472  
Intersegment revenues 302 287 1,773 1,545  
Cost of sales 117 115 859 697  
Operating and administrative expenses 100 100 330 311  
Depreciation and amortization 47 44 142 132  
Income (loss) from equity investees 0   0 0  
Other segment income (loss) 2 2 5 7  
Earnings (loss) before interest expense and income taxes 40 30 447 412  
Interest expense (29) (24) (88) (75)  
Income tax benefit (expense) (2) (1) (81) (77)  
Net income (loss) attributable to UGI 9 5 278 260  
Capital expenditures (including the effects of accruals) 150 146 410 352  
Total assets 6,742 6,228 6,742 6,228  
Operating Segments | Midstream & Marketing          
Segment Reporting [Line Items]          
Revenues from external customers 224 246 1,051 985  
Intersegment revenues 249 278 1,391 1,232  
Cost of sales 159 201 959 815  
Operating and administrative expenses 40 32 111 92  
Depreciation and amortization 22 20 65 60  
Income (loss) from equity investees (1)   8 7  
Other segment income (loss) 3 2 4 4  
Earnings (loss) before interest expense and income taxes 30 27 268 276  
Interest expense (15) (11) (44) (35)  
Income tax benefit (expense) (3) 3 (42) 17  
Net income (loss) attributable to UGI 12 19 182 258  
Capital expenditures (including the effects of accruals) 16 30 38 89  
Total assets 3,222 3,188 3,222 3,188  
Operating Segments | UGI International          
Segment Reporting [Line Items]          
Intersegment revenues 436 437 1,632 1,725  
Cost of sales 250 245 864 967  
Operating and administrative expenses 126 129 401 405  
Depreciation and amortization 27 31 82 89  
Income (loss) from equity investees 0   0 (1)  
Other segment income (loss) 8 11 12 33  
Earnings (loss) before interest expense and income taxes 41 43 297 296  
Interest expense (11) (13) (33) (34)  
Income tax benefit (expense) (12) 6 (40) (33)  
Net income (loss) attributable to UGI 18 36 224 229  
Capital expenditures (including the effects of accruals) 26 24 56 55  
Total assets 2,833 3,191 2,833 3,191  
Operating Segments | AmeriGas Propane          
Segment Reporting [Line Items]          
Intersegment revenues 372 434 1,731 1,909  
Cost of sales 171 207 733 889  
Operating and administrative expenses 220 220 723 713  
Depreciation and amortization 42 45 127 135  
Income (loss) from equity investees 0   0 0  
Other segment income (loss) 8 10 27 28  
Earnings (loss) before interest expense and income taxes (53) (28) 175 200  
Interest expense (35) (36) (110) (106)  
Income tax benefit (expense) 26 101 (18) (78)  
Net income (loss) attributable to UGI (62) 37 47 16  
Capital expenditures (including the effects of accruals) 27 20 86 59  
Total assets 2,821 2,964 2,821 2,964  
Corporate & Other          
Segment Reporting [Line Items]          
Revenues from external customers 0 2 0 (1)  
Cost of sales 89 113 (30) 13  
Operating and administrative expenses 30 24 81 78  
Depreciation and amortization 0 0 0 0  
Income (loss) from equity investees 0   0 0  
Other segment income (loss) 12 (60) 55 3  
Earnings (loss) before interest expense and income taxes (107) (195) 4 (89)  
Interest expense (22) (22) (66) (63)  
Income tax benefit (expense) 19 (44) 15 79  
Net income (loss) attributable to UGI (110) (261) (47) (73)  
Capital expenditures (including the effects of accruals) 0 0 0 0  
Total assets 182 172 182 172  
Intersegment revenues Corporate & Other          
Segment Reporting [Line Items]          
Intersegment revenues $ 0 $ 0 $ 0 $ 0