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Revenue from Contracts with Customers - Disaggregated Revenues by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 01, 2022
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   $ 3,041 $ 3,442 $ 5,762 $ 6,078
Other revenues   65 24 103 61
Total revenues   3,106 3,466 5,865 6,139
Weather Normalization Adjustment Rider | PAPUC | Gas Utility          
Disaggregation of Revenue [Line Items]          
Rate period 5 years        
Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   715 665 1,272 1,060
Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   424 400 760 634
Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   177 167 309 261
Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   53 54 100 97
Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   45 37 77 56
Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   16 7 26 12
Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   2,326 2,777 4,490 5,018
Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   1,328 1,554 2,444 2,804
Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   109 154 211 294
Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   740 909 1,518 1,623
Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   66 50 131 96
Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   10 23 27 29
Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   4 2 7 4
Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   2 14 10 19
Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   67 71 142 149
Eliminations          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (126) (178) (275) (295)
Other revenues   (2) (1) (2) (2)
Total revenues   (128) (179) (277) (297)
Eliminations | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (29) (40) (62) (63)
Eliminations | Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (28) (40) (61) (62)
Eliminations | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (1) 0 (1) (1)
Eliminations | Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (97) (138) (213) (232)
Eliminations | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (39) (81) (116) (136)
Eliminations | Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (58) (57) (97) (96)
Eliminations | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Eliminations | AmeriGas Propane          
Disaggregation of Revenue [Line Items]          
Total revenues   0 0 0 0
Eliminations | UGI International          
Disaggregation of Revenue [Line Items]          
Total revenues   0 0 0 0
Eliminations | Midstream & Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues   98 138 213 232
Eliminations | Utilities          
Disaggregation of Revenue [Line Items]          
Total revenues   28 40 61 63
Operating Segments | AmeriGas Propane          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   847 1,030 1,589 1,790
Other revenues   20 18 44 36
Total revenues   867 1,048 1,633 1,826
Operating Segments | AmeriGas Propane | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   847 1,030 1,589 1,790
Operating Segments | AmeriGas Propane | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   755 908 1,389 1,554
Operating Segments | AmeriGas Propane | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   45 68 96 124
Operating Segments | AmeriGas Propane | Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | AmeriGas Propane | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   47 54 104 112
Operating Segments | UGI International          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   938 1,215 1,807 2,256
Other revenues   10 9 18 17
Total revenues   948 1,224 1,825 2,273
Operating Segments | UGI International | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   938 1,215 1,807 2,256
Operating Segments | UGI International | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   573 646 1,055 1,250
Operating Segments | UGI International | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   64 86 115 170
Operating Segments | UGI International | Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   281 466 599 799
Operating Segments | UGI International | Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | UGI International | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   20 17 38 37
Operating Segments | Midstream & Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   638 670 1,307 1,204
Other revenues   0 1 0 2
Total revenues   638 671 1,307 1,206
Operating Segments | Midstream & Marketing | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   638 670 1,307 1,204
Operating Segments | Midstream & Marketing | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Midstream & Marketing | Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   498 524 1,035 960
Operating Segments | Midstream & Marketing | Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   66 50 131 96
Operating Segments | Midstream & Marketing | Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   68 80 124 125
Operating Segments | Midstream & Marketing | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   4 2 7 4
Operating Segments | Midstream & Marketing | Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   2 14 10 19
Operating Segments | Midstream & Marketing | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   744 705 1,334 1,123
Other revenues   30 2 32 3
Total revenues   774 707 1,366 1,126
Operating Segments | Utilities | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   744 705 1,334 1,123
Operating Segments | Utilities | Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   424 400 760 634
Operating Segments | Utilities | Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   177 167 309 261
Operating Segments | Utilities | Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   53 54 100 97
Operating Segments | Utilities | Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   73 77 138 118
Operating Segments | Utilities | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   17 7 27 13
Operating Segments | Utilities | Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Operating Segments | Utilities | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Other revenues   7 (5) 11 5
Total revenues   7 (5) 11 5
Corporate & Other | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 0 0
Corporate & Other | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   $ 0 $ 0 $ 0 $ 0