CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income including noncontrolling interests	$ (96)	$ 303
Other comprehensive income (loss):
Net gains on derivative instruments (net of tax of $(2) and $0, respectively)	10	0
Reclassifications of net losses on derivative instruments (net of tax of $(2) and $(2), respectively)	4	5
Foreign currency adjustments (net of tax of $(4) and $12, respectively)	(32)	63
Benefit plans (net of tax of $(1) and $0, respectively)	2	0
Other comprehensive (loss) income	(16)	68
Comprehensive (loss) income including noncontrolling interests	(112)	371
Deduct comprehensive income attributable to noncontrolling interests	(1)	0
Comprehensive (loss) income attributable to UGI Corporation	$ (113)	$ 371