CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income including noncontrolling interests	$ (1,502)	$ 1,074	$ 1,467
Net gains on derivative instruments (net of tax of $(9), $(27), and $(1), respectively)	16	64	3
Reclassifications of net (gains) losses on derivative instruments (net of tax of $13, $(1), and $(7), respectively)	(27)	6	18
Foreign currency translation adjustments (net of tax of $21, $(55), and $(4), respectively)	68	(193)	(11)
Foreign currency gains (losses) on long-term intra-company transactions	64	(148)	(12)
Benefit plans, principally actuarial gains (net of tax of $(2), $(10), and $(3), respectively)	5	28	7
Reclassifications of benefit plans actuarial (gains) losses and net prior service benefit (net of tax of $1, $(1), and $(1), respectively)	(2)	3	2
Other comprehensive income (loss)	124	(240)	7
Comprehensive (loss) income including noncontrolling interests	(1,378)	834	1,474
Deduct comprehensive income attributable to noncontrolling interests	0	(1)	0
Comprehensive (loss) income attributable to UGI Corporation	$ (1,378)	$ 833	$ 1,474