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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue By Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 $ 6,452 $ 7,211  
Other revenues                 107 109  
Total revenues $ 1,124 $ 1,199 $ 2,229 $ 2,007 $ 1,150 $ 1,364 $ 2,606 $ 2,200 6,559 7,320 $ 7,651
Negative surcharge                   6  
Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 563 553  
Commercial & Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 215 226  
Large delivery service                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 142 138  
Off-system sales and capacity releases                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 48 46  
Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 14 15  
Total Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 982 978  
Retail                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 3,499 4,008  
Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 211 233  
Energy Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,233 1,521  
Pipeline                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 168 95  
Peaking                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 6 17  
Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 7 2  
Electricity Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 34 43  
Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 312 314  
Total Non-Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 5,470 6,233  
Eliminations                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (229) (302)  
Other revenues                 (3) (4)  
Total revenues                 (232) (306) (371)
Eliminations | Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Commercial & Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Large delivery service                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Off-system sales and capacity releases                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (45) (65)  
Eliminations | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (2) (3)  
Eliminations | Total Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (47) (68)  
Eliminations | Retail                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Energy Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (79) (134)  
Eliminations | Pipeline                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Peaking                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (100) (97)  
Eliminations | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Electricity Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Eliminations | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (3) (3)  
Eliminations | Total Non-Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (182) (234)  
Eliminations | AmeriGas Propane                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 0 0 0
Eliminations | UGI International                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 0 0 0
Eliminations | Midstream & Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 182 235 273
Eliminations | UGI Utilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 47 68 94
Operating Segments | AmeriGas Propane                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 2,315 2,618  
Other revenues                 66 64  
Total revenues                 2,381 2,682 2,823
Operating Segments | AmeriGas Propane | Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Commercial & Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Large delivery service                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 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  
Operating Segments | AmeriGas Propane | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Total Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Retail                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 2,037 2,341  
Operating Segments | AmeriGas Propane | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 63 64  
Operating Segments | AmeriGas Propane | Energy Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Pipeline                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Peaking                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Electricity Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | AmeriGas Propane | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 215 213  
Operating Segments | AmeriGas Propane | Total Non-Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 2,315 2,618  
Operating Segments | UGI International                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 2,104 2,339  
Other revenues                 23 33  
Total revenues                 2,127 2,372 $ 2,684
Operating Segments | UGI International | Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Commercial & Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Large delivery service                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 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  
Operating Segments | UGI International | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Total Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Retail                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,462 1,667  
Operating Segments | UGI International | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 148 169  
Operating Segments | UGI International | Energy Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 434 448  
Operating Segments | UGI International | Pipeline                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Peaking                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Electricity Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI International | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 60 55  
Operating Segments | UGI International | Total Non-Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 2,104 2,339  
Operating Segments | Midstream & Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,233 1,510  
Other revenues                 14 6  
Total revenues                 1,247 1,516  
Operating Segments | Midstream & Marketing | Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Midstream & Marketing | Commercial & Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Midstream & Marketing | Large delivery service                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 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  
Operating Segments | Midstream & Marketing | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Midstream & Marketing | Total Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Midstream & Marketing | Retail                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Midstream & Marketing | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Midstream & Marketing | Energy Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 878 1,207  
Operating Segments | Midstream & Marketing | Pipeline                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 168 95  
Operating Segments | Midstream & Marketing | Peaking                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 106 114  
Operating Segments | Midstream & Marketing | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 7 2  
Operating Segments | Midstream & Marketing | Electricity Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 34 43  
Operating Segments | Midstream & Marketing | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 40 49  
Operating Segments | Midstream & Marketing | Total Non-Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,233 1,510  
Operating Segments | UGI Utilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,029 1,046  
Other revenues                 1 3  
Total revenues                 1,030 1,049  
Operating Segments | UGI Utilities | Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 563 553  
Operating Segments | UGI Utilities | Commercial & Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 215 226  
Operating Segments | UGI Utilities | Large delivery service                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 142 138  
Operating Segments | UGI Utilities | Off-system sales and capacity releases                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 93 111  
Operating Segments | UGI Utilities | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 16 18  
Operating Segments | UGI Utilities | Total Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,029 1,046  
Operating Segments | UGI Utilities | Retail                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Energy Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Pipeline                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Peaking                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Electricity Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | UGI Utilities | Total Non-Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Other revenues                 6 7  
Total revenues                 6 7  
Corporate & Other | Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Commercial & Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Large delivery service                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Off-system sales and capacity releases                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Total Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Retail                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Energy Marketing                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Pipeline                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Peaking                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Electricity Generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate & Other | Total Non-Utility                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 $ 0 $ 0