XML 55 R40.htm IDEA: XBRL DOCUMENT v3.21.1
Revenue from Contracts with Customers - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Disaggregation of Revenue [Line Items]      
Contract liabilities $ 93 $ 88 $ 161
Contract with customer, liability, revenue recognized 131 116  
Midstream & Marketing      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation $ 2,100    
UGI Utilities      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation   $ 200