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Derivative Instruments and Hedging Activities - Narrative (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
EUR (€)
Dec. 07, 2021
EUR (€)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
EUR (€)
Mar. 31, 2021
EUR (€)
Derivative [Line Items]                  
Pre-tax (losses) gains associated with net investment hedges $ 21,000,000 $ 31,000,000 $ 34,000,000 $ (1,000,000)          
Maximum amount of loss 2,035,000,000   2,035,000,000            
Cash collateral received (603,000,000) (37,000,000) (603,000,000) (37,000,000)     $ (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 0     0    
Pre-tax net losses associated with interest rate hedges $ 3,000,000   $ 3,000,000            
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 $ 274,000,000 $ 384,000,000 $ 274,000,000 $ 384,000,000 € 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