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Derivative Instruments and Hedging Activities - Narrative (Details)
12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2023
EUR (€)
Sep. 30, 2022
EUR (€)
Dec. 07, 2021
EUR (€)
Derivative [Line Items]            
Pre-tax net losses associated with interest rate hedges $ 46,000,000          
Pre-tax (losses) gains associated with net investment hedges (57,000,000) $ 123,000,000 $ 9,000,000      
Maximum amount of loss 298,000,000          
Cash collateral received 40,000,000 398,000,000        
3.25% Senior Notes Due November 2025 | UGI Utilities Senior Notes: | UGI International LLC            
Derivative [Line Items]            
Interest rate           3.25%
IRPA            
Derivative [Line Items]            
Notional amount $ 0 0        
Foreign Exchange Forward            
Derivative [Line Items]            
Potential exposure coverage, percent (as a percentage) 90.00%     90.00%    
Foreign currency contracts            
Derivative [Line Items]            
Notional amount $ 425,000,000 $ 465,000,000   € 256,000,000 € 411,000,000  
Foreign currency contracts | UGI International LLC | Net Investment Hedging            
Derivative [Line Items]            
Notional amount | €           € 93,000,000