CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interests	$ 269	$ (1,502)	$ 1,074
Net (losses) gains on derivative instruments (net of tax of $5, $(9), and $(27), respectively)	(14)	16	64
Reclassifications of net (gains) losses on derivative instruments (net of tax of $14, $13, and $(1), respectively)	(35)	(27)	6
Foreign currency translation adjustments (net of tax of $14, $21, and $(55), respectively)	12	68	(193)
Foreign currency gains (losses) on long-term intra-company transactions	47	64	(148)
Benefit plans, principally actuarial (losses) gains (net of tax of $2, $(2), and $(10), respectively)	(7)	5	28
Reclassifications of benefit plans actuarial (gains) losses and net prior service cost (benefit) (net of tax of $0, $1, and $(1), respectively)	0	(2)	3
Other comprehensive income (loss)	3	124	(240)
Comprehensive income (loss) including noncontrolling interests	272	(1,378)	834
Deduct comprehensive income attributable to noncontrolling interests	0	0	(1)
Comprehensive income (loss) attributable to UGI Corporation	$ 272	$ (1,378)	$ 833