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Revenue from Contracts with Customers - Disaggregation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 1,474 $ 1,171 $ 5,929 $ 5,349
Other revenue 22 28 80 86
Total revenues 1,496 1,199 6,009 5,435
Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 168 171 864 861
Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 90 103 498 499
Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 34 30 190 193
Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 33 30 117 113
Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6 5 43 44
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5 3 16 12
Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,306 1,000 5,065 4,488
Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 800 622 3,250 2,911
Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 77 32 235 172
Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 311 223 1,205 1,005
Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 45 40 138 128
Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1 (1) 12 6
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 3 6 6
Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1 6 8 23
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 69 75 211 237
Eliminations        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (39) (27) (233) (200)
Other revenue (1) (1) (3) (2)
Total revenues (40) (28) (236) (202)
Eliminations | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (10) (7) (50) (38)
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 (10) (7) (49) (37)
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 (29) (20) (183) (162)
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 (24) (16) (89) (64)
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) (4) (94) (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 (2)
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 29 20 183 162
Eliminations | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues 10 7 50 38
Operating Segments | AmeriGas Propane        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 510 435 2,082 1,934
Other revenue 16 16 50 49
Total revenues 526 451 2,132 1,983
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 510 435 2,082 1,934
Operating Segments | AmeriGas Propane | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 424 372 1,829 1,715
Operating Segments | AmeriGas Propane | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 35 10 92 51
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 51 53 161 168
Operating Segments | UGI International        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 565 366 2,084 1,709
Other revenue 7 5 22 17
Total revenues 572 371 2,106 1,726
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 565 366 2,084 1,709
Operating Segments | UGI International | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 376 250 1,421 1,196
Operating Segments | UGI International | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 42 22 143 121
Operating Segments | UGI International | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 129 81 470 349
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 13 50 43
Operating Segments | Midstream & Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 260 219 1,082 1,007
Other revenue 1 3 4 10
Total revenues 261 222 1,086 1,017
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 260 219 1,082 1,007
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 206 158 824 720
Operating Segments | Midstream & Marketing | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 45 40 138 128
Operating Segments | Midstream & Marketing | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6 3 106 102
Operating Segments | Midstream & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 3 6 6
Operating Segments | Midstream & Marketing | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1 6 8 23
Operating Segments | Midstream & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 9 0 28
Operating Segments | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 178 178 914 899
Other revenue 3 1 9 2
Total revenues 181 179 923 901
Operating Segments | UGI Utilities | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 178 178 914 899
Operating Segments | UGI Utilities | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 90 103 498 499
Operating Segments | UGI Utilities | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 34 30 190 193
Operating Segments | UGI Utilities | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 33 30 117 113
Operating Segments | UGI Utilities | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 16 12 92 81
Operating Segments | UGI Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5 3 17 13
Operating Segments | UGI Utilities | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI Utilities | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI Utilities | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI Utilities | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI Utilities | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI Utilities | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI Utilities | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | UGI 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 revenue (4) 4 (2) 10
Total revenues (4) 4 (2) 10
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