CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income attributable to UGI Corporation	$ 150	$ 85	$ 942	$ 523
Other comprehensive income (loss):
Net (losses) gains on derivative instruments (net of tax of $1, $3, $(1) and $15, respectively)	0	(8)	4	(38)
Reclassifications of net losses on derivative instruments (net of tax of $(1), $(1), $(5) and $(2), respectively)	5	5	14	6
Foreign currency adjustments (net of tax of $3, $4, $5 and $4, respectively)	16	28	23	42
Benefit plans (net of tax of $(1), $0, $(1) and $(1), respectively)	0	0	1	2
Other comprehensive income	21	25	42	12
Comprehensive income attributable to UGI Corporation	$ 171	$ 110	$ 984	$ 535