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Derivative Instruments and Hedging Activities - Narrative (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
EUR (€)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
EUR (€)
Mar. 31, 2022
EUR (€)
Dec. 07, 2021
EUR (€)
Derivative [Line Items]                  
Pre-tax (losses) gains associated with net investment hedges $ (9,000,000) $ 21,000,000 $ (73,000,000) $ 34,000,000          
Maximum amount of loss 422,000,000   422,000,000            
Cash collateral received (55,000,000) (603,000,000) (55,000,000) (603,000,000)   $ (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 $ 39,000,000   $ 39,000,000            
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 $ 285,000,000 $ 274,000,000 $ 285,000,000 $ 274,000,000 € 331,000,000 $ 465,000,000 € 411,000,000 € 486,000,000  
Foreign currency contracts | UGI International | Net Investment Hedges:                  
Derivative [Line Items]                  
Notional amount | €                 € 93,000,000