SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Condensed Financial Statements, Captions [Line Items]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 1,182	$ 1,107	$ 716
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used by investing activities	(792)	(1,077)	(1,012)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(318)	(308)	(296)
Issuances of debt, net of issuance costs	1,321	1,930	1,257
Issuances of UGI Common Stock	0	12	19
Repurchases of UGI Common Stock	0	(22)	(38)
Net cash used by financing activities	(506)	(168)	(51)
Cash, cash equivalents and restricted cash decrease	(112)	(129)	(408)
Cash and cash equivalents:
Cash, cash equivalents and restricted cash at end of year	228	340	469
Cash, cash equivalents and restricted cash at beginning of year	340	469	877
Cash and cash equivalents (decrease) increase	(112)	(129)	(408)
Parent Company
Condensed Financial Statements, Captions [Line Items]
NET CASH PROVIDED BY OPERATING ACTIVITIES	379	636	485
CASH FLOWS FROM INVESTING ACTIVITIES
Return of capital distributions	0	0	175
Net investments in unconsolidated subsidiaries	(355)	(309)	(390)
Net cash used by investing activities	(355)	(309)	(215)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(318)	(308)	(296)
Issuances of debt, net of issuance costs	1,078	327	597
Repayments of long-term debt	(775)	(333)	(530)
Issuances of UGI Common Stock	0	12	19
Repurchases of UGI Common Stock	0	(22)	(38)
Payments on Purchase Contracts	(12)	(16)	(16)
Net cash used by financing activities	(27)	(340)	(264)
Cash, cash equivalents and restricted cash decrease	(3)	(13)	6
Cash and cash equivalents:
Cash, cash equivalents and restricted cash at end of year	4	7	20
Cash, cash equivalents and restricted cash at beginning of year	7	20	14
Cash and cash equivalents (decrease) increase	(3)	(13)	6
Dividends from unconsolidated subsidiaries	$ 420	$ 680	$ 506