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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income (loss) attributable to UGI Corporation $ (133) $ (163) $ 684 $ 691
Other comprehensive income (loss):        
Net gains (losses) on derivative instruments (net of tax of $(3), $0, $(6) and $(3), respectively) 7 (2) 16 9
Reclassifications of net losses (gains) on derivative instruments (net of tax of $0, $1, $1 and $1, respectively) (1) (1) (4) (2)
Foreign currency adjustments (net of tax of $(4), $24, $(8) and $15, respectively) (2) 89 (20) 64
Benefit plans (net of tax of $0, $0, $0 and $0, respectively) (1) 1 (1) 1
Other comprehensive income (loss) 3 87 (9) 72
Comprehensive income (loss) attributable to UGI Corporation $ (130) $ (76) $ 675 $ 763