SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) - STATEMENTS OF INCOME (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 8,928	$ 10,106	$ 7,447
Costs and expenses:
Operating and administrative expenses	2,158	2,028	2,014
Other operating income, net	(132)	(79)	(33)
Total costs and expenses	10,372	8,440	5,097
Operating (loss) income	(1,444)	1,666	2,350
Pension and other postretirement plans non-service expense	9	5	1
Income tax (benefit) expense	(335)	313	522
Equity in (loss) income of unconsolidated subsidiaries	2	(14)	(63)
Net (loss) income attributable to UGI Corporation	(1,502)	1,073	1,467
Comprehensive (loss) income attributable to UGI Corporation	$ (1,378)	$ 833	$ 1,474
(Loss) earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ (7.16)	$ 5.11	$ 7.02
Diluted (in dollars per share)	$ (7.16)	$ 4.97	$ 6.92
Weighted - average common shares outstanding (thousands):
Basic (in shares)	209,806	209,940	209,063
Diluted (in shares)	209,806	215,821	212,126
Parent Company
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 0	$ 0	$ 0
Costs and expenses:
Operating and administrative expenses	95	74	94
Other operating income, net	(83)	(63)	(65)
Total costs and expenses	12	11	29
Operating (loss) income	(12)	(11)	(29)
Pension and other postretirement plans non-service expense	0	(3)	0
Interest expense	(52)	(35)	(27)
Loss before income taxes	(64)	(49)	(56)
Income tax (benefit) expense	(13)	0	9
Loss before equity in income of unconsolidated subsidiaries	(51)	(49)	(65)
Equity in (loss) income of unconsolidated subsidiaries	(1,451)	1,122	1,532
Net (loss) income attributable to UGI Corporation	(1,502)	1,073	1,467
Other comprehensive (loss) income	(8)	34	7
Equity in other comprehensive income (loss) of unconsolidated subsidiaries	132	(274)	0
Comprehensive (loss) income attributable to UGI Corporation	$ (1,378)	$ 833	$ 1,474
(Loss) earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ (7.16)	$ 5.11	$ 7.02
Diluted (in dollars per share)	$ (7.16)	$ 4.97	$ 6.92
Weighted - average common shares outstanding (thousands):
Basic (in shares)	209,806	209,940	209,063
Diluted (in shares)	209,806	215,821	212,126