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Revenue from Contracts with Customers - Disaggregated Revenues by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 3,442 $ 2,552 $ 6,078 $ 4,455
Other revenues 24 29 61 58
Total revenues 3,466 2,581 6,139 4,513
Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 665 412 1,060 696
Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 400 243 634 408
Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 167 96 261 156
Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 54 44 97 84
Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 37 22 56 37
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7 7 12 11
Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,777 2,140 5,018 3,759
Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,554 1,395 2,804 2,450
Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 154 99 294 158
Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 909 514 1,623 894
Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 50 48 96 93
Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23 9 29 11
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 2 4 4
Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 14 3 19 7
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 71 70 149 142
Eliminations        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (178) (117) (295) (194)
Other revenues (1) (1) (2) (2)
Total revenues (179) (118) (297) (196)
Eliminations | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (40) (25) (63) (40)
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 (40) (25) (62) (39)
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 (138) (92) (232) (154)
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 (81) (39) (136) (65)
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 (57) (53) (96) (89)
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 138 92 232 154
Eliminations | Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues 40 25 63 40
Operating Segments | AmeriGas Propane        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,030 925 1,790 1,572
Other revenues 18 15 36 34
Total revenues 1,048 940 1,826 1,606
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 1,030 925 1,790 1,572
Operating Segments | AmeriGas Propane | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 908 833 1,554 1,405
Operating Segments | AmeriGas Propane | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 68 38 124 57
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 54 54 112 110
Operating Segments | UGI International        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,215 825 2,256 1,519
Other revenues 9 9 17 15
Total revenues 1,224 834 2,273 1,534
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 1,215 825 2,256 1,519
Operating Segments | UGI International | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 646 562 1,250 1,045
Operating Segments | UGI International | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 86 61 170 101
Operating Segments | UGI International | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 466 186 799 341
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 17 16 37 32
Operating Segments | Midstream & Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 670 482 1,204 822
Other revenues 1 2 2 3
Total revenues 671 484 1,206 825
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 670 482 1,204 822
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 524 367 960 618
Operating Segments | Midstream & Marketing | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 50 48 96 93
Operating Segments | Midstream & Marketing | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 80 62 125 100
Operating Segments | Midstream & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 2 4 4
Operating Segments | Midstream & Marketing | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 14 3 19 7
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 705 437 1,123 736
Other revenues 2 5 3 6
Total revenues 707 442 1,126 742
Operating Segments | Utilities | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 705 437 1,123 736
Operating Segments | Utilities | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 400 243 634 408
Operating Segments | Utilities | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 167 96 261 156
Operating Segments | Utilities | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 54 44 97 84
Operating Segments | Utilities | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 77 47 118 76
Operating Segments | Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7 7 13 12
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 (5) (1) 5 2
Total revenues (5) (1) 5 2
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