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Derivative Instruments and Hedging Activities - Narrative (Details)
3 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 07, 2021
EUR (€)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Derivative [Line Items]              
Pre-tax (losses) gains associated with net investment hedges $ 13,000,000 $ (32,000,000)          
Maximum amount of loss 1,156,000,000            
Cash collateral received (205,000,000) (6,000,000)     $ (468,000,000)    
UGI International | Senior Notes | 3.25% Senior notes due November 2025              
Derivative [Line Items]              
Interest rate       3.25%      
IRPAs              
Derivative [Line Items]              
Notional amount 0 0     0    
Pre-tax net losses associated with interest rate hedges $ 4,000,000            
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 $ 415,000,000 $ 457,000,000 € 486,000,000   $ 509,000,000 € 173,000,000 € 173,000,000
Foreign currency contracts | UGI International | Net Investment Hedging              
Derivative [Line Items]              
Notional amount | €       € 93,000,000