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Derivative Instruments and Hedging Activities - Narrative (Details)
3 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
EUR (€)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 07, 2021
EUR (€)
Derivative [Line Items]              
Pre-tax (losses) gains associated with net investment hedges $ (64,000,000) $ 13,000,000          
Maximum amount of loss 772,000,000            
Cash collateral received (108,000,000) (205,000,000)   $ (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      
Pre-tax net gains associated with interest rate hedges $ 39,000,000            
Forward foreign currency exchange contracts              
Derivative [Line Items]              
Derivative notional amount percent of required need coverage 90.00%   90.00%        
Foreign currency contracts              
Derivative [Line Items]              
Notional amount $ 390,000,000 $ 415,000,000 € 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