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Revenue from Contracts with Customers - Disaggregation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 2,552 $ 2,203 $ 4,455 $ 4,178
Other revenue 29 26 58 58
Total revenues 2,581 2,229 4,513 4,236
Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 412 376 696 690
Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 243 212 408 396
Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 96 95 156 163
Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 44 42 84 83
Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 22 22 37 39
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7 5 11 9
Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,140 1,827 3,759 3,488
Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,395 1,195 2,450 2,289
Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 99 74 158 140
Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 514 419 894 782
Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 48 45 93 88
Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 9 3 11 7
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 1 4 3
Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3 8 7 17
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 70 82 142 162
Eliminations        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (117) (94) (194) (173)
Other revenue (1) 0 (2) (1)
Total revenues (118) (94) (196) (174)
Eliminations | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (25) (16) (40) (31)
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 (25) (16) (39) (30)
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 (92) (78) (154) (142)
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) (22) (65) (48)
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 (53) (54) (89) (92)
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 (2) 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 92 78 154 142
Eliminations | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues 25 16 40 31
Operating Segments | AmeriGas Propane        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 925 787 1,572 1,499
Other revenue 15 15 34 33
Total revenues 940 802 1,606 1,532
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 925 787 1,572 1,499
Operating Segments | AmeriGas Propane | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 833 712 1,405 1,343
Operating Segments | AmeriGas Propane | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 38 19 57 41
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 56 110 115
Operating Segments | UGI International        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 825 700 1,519 1,343
Other revenue 9 4 15 12
Total revenues 834 704 1,534 1,355
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 825 700 1,519 1,343
Operating Segments | UGI International | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 562 483 1,045 946
Operating Segments | UGI International | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 61 55 101 99
Operating Segments | UGI International | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 186 144 341 268
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 16 18 32 30
Operating Segments | Midstream & Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 482 418 822 788
Other revenue 2 4 3 7
Total revenues 484 422 825 795
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 482 418 822 788
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 367 297 618 562
Operating Segments | Midstream & Marketing | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 48 45 93 88
Operating Segments | Midstream & Marketing | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 62 57 100 99
Operating Segments | Midstream & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 1 4 3
Operating Segments | Midstream & Marketing | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3 8 7 17
Operating Segments | Midstream & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 10 0 19
Operating Segments | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 437 392 736 721
Other revenue 5 1 6 1
Total revenues 442 393 742 722
Operating Segments | UGI Utilities | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 437 392 736 721
Operating Segments | UGI Utilities | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 243 212 408 396
Operating Segments | UGI Utilities | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 96 95 156 163
Operating Segments | UGI Utilities | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 44 42 84 83
Operating Segments | UGI Utilities | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 47 38 76 69
Operating Segments | UGI Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7 5 12 10
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 (1) 2 2 6
Total revenues (1) 2 2 6
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