CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 1,496	$ 1,199	$ 6,009	$ 5,435
Costs and expenses:
Cost of sales (excluding depreciation and amortization shown below)	516	417	2,623	2,673
Operating and administrative expenses	469	437	1,473	1,452
Impairment of assets held-for-sale	0	52	0	52
Depreciation and amortization	125	122	375	362
Other operating income, net	(5)	(3)	(26)	(17)
Costs and expenses	1,105	1,025	4,445	4,522
Operating income	391	174	1,564	913
(Loss) income from equity investees	(86)	7	(69)	22
Other non-operating income (expense), net	1	(4)	0	(4)
Interest expense	(77)	(80)	(233)	(247)
Income (loss) before income taxes	229	97	1,262	684
Income tax expense	(79)	(12)	(320)	(161)
Net income attributable to UGI Corporation	$ 150	$ 85	$ 942	$ 523
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in USD per share)	$ 0.72	$ 0.41	$ 4.51	$ 2.50
Diluted (in USD per share)	$ 0.71	$ 0.41	$ 4.48	$ 2.49
Weighted-average common shares outstanding (thousands):
Basic (in shares)	209,099	208,598	208,934	208,989
Diluted (in shares)	210,851	208,975	210,194	210,009