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Revenue from Contracts with Customers - Disaggregated Revenues by Reportable Segment (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Nov. 01, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 3,041 | $ 3,442 | $ 5,762 | $ 6,078
Other revenues |  | 65 | 24 | 103 | 61
Total revenues |  | 3,106 | 3,466 | 5,865 | 6,139
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 |  | 715 | 665 | 1,272 | 1,060
Residential |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 424 | 400 | 760 | 634
Commercial & Industrial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 177 | 167 | 309 | 261
Large delivery service |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 53 | 54 | 100 | 97
Off-system sales and capacity releases |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 45 | 37 | 77 | 56
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 16 | 7 | 26 | 12
Total Non-Utility |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2,326 | 2,777 | 4,490 | 5,018
Retail |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,328 | 1,554 | 2,444 | 2,804
Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 109 | 154 | 211 | 294
Energy Marketing |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 740 | 909 | 1,518 | 1,623
Pipeline |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 66 | 50 | 131 | 96
Peaking |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 10 | 23 | 27 | 29
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 4 | 2 | 7 | 4
Electricity Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2 | 14 | 10 | 19
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 67 | 71 | 142 | 149
Eliminations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (126) | (178) | (275) | (295)
Other revenues |  | (2) | (1) | (2) | (2)
Total revenues |  | (128) | (179) | (277) | (297)
Eliminations | Total Utility |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (29) | (40) | (62) | (63)
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 |  | (28) | (40) | (61) | (62)
Eliminations | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (1) | 0 | (1) | (1)
Eliminations | Total Non-Utility |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (97) | (138) | (213) | (232)
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) | (81) | (116) | (136)
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 |  | (58) | (57) | (97) | (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 | 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 |  | 98 | 138 | 213 | 232
Eliminations | Utilities |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 28 | 40 | 61 | 63
Operating Segments | AmeriGas Propane |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 847 | 1,030 | 1,589 | 1,790
Other revenues |  | 20 | 18 | 44 | 36
Total revenues |  | 867 | 1,048 | 1,633 | 1,826
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 |  | 847 | 1,030 | 1,589 | 1,790
Operating Segments | AmeriGas Propane | Retail |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 755 | 908 | 1,389 | 1,554
Operating Segments | AmeriGas Propane | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 45 | 68 | 96 | 124
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 | 54 | 104 | 112
Operating Segments | UGI International |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 938 | 1,215 | 1,807 | 2,256
Other revenues |  | 10 | 9 | 18 | 17
Total revenues |  | 948 | 1,224 | 1,825 | 2,273
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 |  | 938 | 1,215 | 1,807 | 2,256
Operating Segments | UGI International | Retail |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 573 | 646 | 1,055 | 1,250
Operating Segments | UGI International | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 64 | 86 | 115 | 170
Operating Segments | UGI International | Energy Marketing |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 281 | 466 | 599 | 799
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 |  | 20 | 17 | 38 | 37
Operating Segments | Midstream & Marketing |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 638 | 670 | 1,307 | 1,204
Other revenues |  | 0 | 1 | 0 | 2
Total revenues |  | 638 | 671 | 1,307 | 1,206
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 |  | 638 | 670 | 1,307 | 1,204
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 |  | 498 | 524 | 1,035 | 960
Operating Segments | Midstream & Marketing | Pipeline |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 66 | 50 | 131 | 96
Operating Segments | Midstream & Marketing | Peaking |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 68 | 80 | 124 | 125
Operating Segments | Midstream & Marketing | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 4 | 2 | 7 | 4
Operating Segments | Midstream & Marketing | Electricity Generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2 | 14 | 10 | 19
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 |  | 744 | 705 | 1,334 | 1,123
Other revenues |  | 30 | 2 | 32 | 3
Total revenues |  | 774 | 707 | 1,366 | 1,126
Operating Segments | Utilities | Total Utility |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 744 | 705 | 1,334 | 1,123
Operating Segments | Utilities | Residential |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 424 | 400 | 760 | 634
Operating Segments | Utilities | Commercial & Industrial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 177 | 167 | 309 | 261
Operating Segments | Utilities | Large delivery service |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 53 | 54 | 100 | 97
Operating Segments | Utilities | Off-system sales and capacity releases |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 73 | 77 | 138 | 118
Operating Segments | Utilities | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 17 | 7 | 27 | 13
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 |  | 7 | (5) | 11 | 5
Total revenues |  | 7 | (5) | 11 | 5
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

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