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Derivative Instruments and Hedging Activities - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
EUR (€)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
EUR (€)
Jun. 30, 2022
EUR (€)
Dec. 07, 2021
EUR (€)
Derivative [Line Items]                  
Pre-tax (losses) gains associated with net investment hedges $ (7,000,000) $ 41,000,000 $ (80,000,000) $ 75,000,000          
Maximum amount of loss 305,000,000   305,000,000            
Cash collateral received 36,000,000 659,000,000 36,000,000 659,000,000   $ 398,000,000      
UGI International | Senior Notes | 3.25% Senior Notes due November 1, 2025                  
Derivative [Line Items]                  
Interest rate                 3.25%
IRPAs                  
Derivative [Line Items]                  
Notional amount 0 0 0 0   0      
Pre-tax net gains associated with interest rate hedges $ 49,000,000   $ 49,000,000            
Forward foreign currency exchange contracts                  
Derivative [Line Items]                  
Derivative notional amount percent of required need coverage 90.00%   90.00%   90.00%        
Foreign currency contracts                  
Derivative [Line Items]                  
Notional amount $ 434,000,000 $ 435,000,000 $ 434,000,000 $ 435,000,000 € 256,000,000 $ 465,000,000 € 411,000,000 € 411,000,000  
Foreign currency contracts | UGI International | Net Investment Hedges:                  
Derivative [Line Items]                  
Notional amount | €                 € 93,000,000