CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 7,447	$ 6,559	$ 7,320
Costs and expenses:
Cost of sales (excluding depreciation and amortization shown below)	2,614	3,149	4,323
Operating and administrative expenses	2,014	1,911	1,963
Loss on disposals of Conemaugh and HVAC	0	54	0
Depreciation and amortization	502	484	448
Other operating income, net	(33)	(21)	(31)
Total costs and expenses	5,097	5,577	6,703
Operating income	2,350	982	617
(Loss) income from equity investees	(63)	27	9
Loss on extinguishments of debt	0	0	(6)
Other non-operating income (expense), net	12	(20)	39
Interest expense	(310)	(322)	(258)
Income before income taxes	1,989	667	401
Income tax expense	(522)	(135)	(93)
Net income including noncontrolling interests	1,467	532	308
Deduct net income attributable to noncontrolling interests, principally in AmeriGas Partners prior to the AmeriGas Merger	0	0	(52)
Net income attributable to UGI Corporation	$ 1,467	$ 532	$ 256
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 7.02	$ 2.55	$ 1.44
Diluted (in dollars per share)	$ 6.92	$ 2.54	$ 1.41
Weighted-average common shares outstanding:
Basic (in shares)	209,063	208,928	178,417
Diluted (in shares)	212,126	209,869	181,111