CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income attributable to UGI Corporation	$ 489	$ 226	$ 792	$ 438
Other comprehensive income (loss):
Net gains (losses) on derivative instruments (net of tax of $(2), $14, $(2) and $12, respectively)	4	(36)	4	(30)
Reclassifications of net losses on derivative instruments (net of tax of $(2), $(1), $(4) and $(1), respectively)	4	0	9	1
Foreign currency adjustments (net of tax of $(10), $(7), $2 and $0, respectively)	(56)	(33)	7	14
Benefit plans (net of tax of $0, $(1), $0 and $(1), respectively)	1	2	1	2
Other comprehensive (loss) income	(47)	(67)	21	(13)
Comprehensive income attributable to UGI Corporation	$ 442	$ 159	$ 813	$ 425