CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 2,581	$ 2,229	$ 4,513	$ 4,236
Costs and expenses:
Cost of sales (excluding depreciation and amortization shown below)	1,274	1,248	2,107	2,256
Operating and administrative expenses	515	504	1,004	1,015
Depreciation and amortization	126	121	250	240
Other operating income, net	(5)	(6)	(21)	(14)
Costs and expenses	1,910	1,867	3,340	3,497
Operating income	671	362	1,173	739
Income from equity investees	10	8	17	15
Other non-operating income (expense), net	18	12	(1)	0
Interest expense	(78)	(83)	(156)	(167)
Income before income taxes	621	299	1,033	587
Income tax expense	(132)	(73)	(241)	(149)
Net income attributable to UGI Corporation	$ 489	$ 226	$ 792	$ 438
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in USD per share)	$ 2.34	$ 1.08	$ 3.79	$ 2.09
Diluted (in USD per share)	$ 2.33	$ 1.07	$ 3.77	$ 2.08
Weighted-average common shares outstanding (thousands):
Basic (in shares)	208,930	208,941	208,849	209,151
Diluted (in shares)	210,092	209,808	209,863	210,494