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Revenue from Contracts with Customers - Disaggregated Revenues by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Nov. 01, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   $ 1,620 $ 2,004 $ 7,382 $ 8,082
Other revenues   39 29 142 90
Total revenues   1,659 2,033 7,524 8,172
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   265 249 1,537 1,309
Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   151 140 911 774
Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   60 57 369 318
Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   39 38 139 135
Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   7 9 84 65
Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   8 5 34 17
Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   1,355 1,755 5,845 6,773
Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   799 880 3,243 3,684
Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   76 107 287 401
Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   336 631 1,854 2,254
Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   58 53 189 149
Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   1 9 28 38
Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   3 2 10 6
Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   17 1 27 20
Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   65 72 207 221
Eliminations          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (26) (99) (301) (394)
Other revenues   1 0 (1) (2)
Total revenues   (25) (99) (302) (396)
Eliminations | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (7) (24) (69) (87)
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   (7) (24) (68) (86)
Eliminations | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   0 0 (1) (1)
Eliminations | Total Non-Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   (19) (75) (232) (307)
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   (14) (70) (130) (206)
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   (5) (5) (102) (101)
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   19 75 232 307
Eliminations | Utilities          
Disaggregation of Revenue [Line Items]          
Total revenues   8 24 69 87
Operating Segments | AmeriGas Propane          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   494 577 2,083 2,367
Other revenues   20 20 64 56
Total revenues   514 597 2,147 2,423
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   494 577 2,083 2,367
Operating Segments | AmeriGas Propane | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   423 478 1,812 2,032
Operating Segments | AmeriGas Propane | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   24 48 120 172
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 51 151 163
Operating Segments | UGI International          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   602 728 2,409 2,984
Other revenues   9 10 27 27
Total revenues   611 738 2,436 3,011
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   602 728 2,409 2,984
Operating Segments | UGI International | Retail          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   376 402 1,431 1,652
Operating Segments | UGI International | Wholesale          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   52 59 167 229
Operating Segments | UGI International | Energy Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   156 246 755 1,045
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   18 21 56 58
Operating Segments | Midstream & Marketing          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   278 525 1,585 1,729
Other revenues   1 0 1 2
Total revenues   279 525 1,586 1,731
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   278 525 1,585 1,729
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   194 455 1,229 1,415
Operating Segments | Midstream & Marketing | Pipeline          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   58 53 189 149
Operating Segments | Midstream & Marketing | Peaking          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   6 14 130 139
Operating Segments | Midstream & Marketing | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   3 2 10 6
Operating Segments | Midstream & Marketing | Electricity Generation          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   17 1 27 20
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   272 273 1,606 1,396
Other revenues   6 1 38 4
Total revenues   278 274 1,644 1,400
Operating Segments | Utilities | Total Utility          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   272 273 1,606 1,396
Operating Segments | Utilities | Residential          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   151 140 911 774
Operating Segments | Utilities | Commercial & Industrial          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   60 57 369 318
Operating Segments | Utilities | Large delivery service          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   39 38 139 135
Operating Segments | Utilities | Off-system sales and capacity releases          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   14 33 152 151
Operating Segments | Utilities | Other          
Disaggregation of Revenue [Line Items]          
Total revenues from contracts with customers   8 5 35 18
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   2 (2) 13 3
Total revenues   2 (2) 13 3
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