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, 2022	Sep. 30, 2021	Sep. 30, 2020
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 10,106	$ 7,447	$ 6,559
Costs and expenses:
Operating and administrative expenses	2,028	2,014	1,911
Other operating income, net	(79)	(33)	(21)
Total costs and expenses	8,440	5,097	5,577
Operating income	1,666	2,350	982
Pension and other postretirement plans non-service expense	5	1	0
Income tax expense	313	522	135
Equity in income of unconsolidated subsidiaries	(14)	(63)	27
Net income attributable to UGI Corporation	1,073	1,467	532
Comprehensive income attributable to UGI Corporation	$ 833	$ 1,474	$ 602
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 5.11	$ 7.02	$ 2.55
Diluted (in dollars per share)	$ 4.97	$ 6.92	$ 2.54
Weighted - average common shares outstanding (thousands):
Basic (in shares)	209,940	209,063	208,928
Diluted (in shares)	215,821	212,126	209,869
Parent Company
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 0	$ 0	$ 0
Costs and expenses:
Operating and administrative expenses	74	94	56
Other operating income, net	(63)	(65)	(54)
Total costs and expenses	11	29	2
Operating income	(11)	(29)	(2)
Pension and other postretirement plans non-service expense	(3)	0	0
Interest expense	(35)	(27)	(32)
Loss before income taxes	(49)	(56)	(34)
Income tax expense	0	9	17
Loss before equity in income of unconsolidated subsidiaries	(49)	(65)	(51)
Equity in income of unconsolidated subsidiaries	1,122	1,532	583
Net income attributable to UGI Corporation	1,073	1,467	532
Other comprehensive income (loss)	34	7	(12)
Equity in other comprehensive (loss) income of unconsolidated subsidiaries	(274)	0	82
Comprehensive income attributable to UGI Corporation	$ 833	$ 1,474	$ 602
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in dollars per share)	$ 5.11	$ 7.02	$ 2.55
Diluted (in dollars per share)	$ 4.97	$ 6.92	$ 2.54
Weighted - average common shares outstanding (thousands):
Basic (in shares)	209,940	209,063	208,928
Diluted (in shares)	215,821	212,126	209,869