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, 2024	Sep. 30, 2023	Sep. 30, 2022
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 7,210	$ 8,928	$ 10,106
Costs and expenses:
Operating and administrative expenses	2,132	2,158	2,028
Other operating income, net	(62)	(132)	(79)
Total costs and expenses	6,440	10,372	8,440
Operating income (loss)	770	(1,444)	1,666
Pension and other postretirement plans non-service expense	6	9	5
Income tax benefit	71	(335)	313
Equity in income (loss) of unconsolidated subsidiaries	(19)	2	(14)
Net income (loss) attributable to UGI Corporation	269	(1,502)	1,073
Comprehensive income (loss) attributable to UGI Corporation	$ 272	$ (1,378)	$ 833
Earnings (loss) per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 1.27	$ (7.16)	$ 5.11
Diluted (in dollars per share)	$ 1.25	$ (7.16)	$ 4.97
Weighted - average common shares outstanding (thousands):
Basic (in shares)	211,309	209,806	209,940
Diluted (in shares)	215,271	209,806	215,821
Parent Company
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 0	$ 0	$ 0
Costs and expenses:
Operating and administrative expenses	100	95	74
Other operating income, net	(86)	(83)	(63)
Total costs and expenses	14	12	11
Operating income (loss)	(14)	(12)	(11)
Pension and other postretirement plans non-service expense	0	0	(3)
Interest expense	(61)	(52)	(35)
Loss before income taxes	(75)	(64)	(49)
Income tax benefit	(7)	(13)	0
Loss before equity in income of unconsolidated subsidiaries	(68)	(51)	(49)
Equity in income (loss) of unconsolidated subsidiaries	337	(1,451)	1,122
Net income (loss) attributable to UGI Corporation	269	(1,502)	1,073
Other comprehensive (loss) income	(17)	(8)	34
Equity in other comprehensive income (loss) of unconsolidated subsidiaries	20	132	(274)
Comprehensive income (loss) attributable to UGI Corporation	$ 272	$ (1,378)	$ 833
Earnings (loss) per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 1.27	$ (7.16)	$ 5.11
Diluted (in dollars per share)	$ 1.25	$ (7.16)	$ 4.97
Weighted - average common shares outstanding (thousands):
Basic (in shares)	211,309	209,806	209,940
Diluted (in shares)	215,271	209,806	215,821