SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Condensed Financial Statements, Captions [Line Items]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 1,107	$ 716	$ 1,481
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used by investing activities	(1,077)	(1,012)	(1,113)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(308)	(296)	(282)
Issuances of debt, net of issuance costs	1,930	1,257	656
Issuances of UGI Common Stock	12	19	19
Repurchases of UGI Common Stock	(22)	(38)	0
Net cash (used) provided by financing activities	(168)	(51)	166
Cash, cash equivalents and restricted cash (decrease) increase	(129)	(408)	520
Cash and cash equivalents:
Cash, cash equivalents and restricted cash at end of year	340	469	877
Cash, cash equivalents and restricted cash at beginning of year	469	877	357
Cash and cash equivalents (decrease) increase	(129)	(408)	520
Parent Company
Condensed Financial Statements, Captions [Line Items]
NET CASH PROVIDED BY OPERATING ACTIVITIES	636	485	300
CASH FLOWS FROM INVESTING ACTIVITIES
Return of capital distributions	0	175	0
Net investments in unconsolidated subsidiaries	(309)	(390)	(401)
Net cash used by investing activities	(309)	(215)	(401)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends on UGI Common Stock	(308)	(296)	(282)
Issuances of debt, net of issuance costs	327	597	483
Repayments of long-term debt	(333)	(530)	(385)
Issuance of Preferred Stock, net of issuance costs	0	0	213
Issuances of UGI Common Stock	12	19	19
Repurchases of UGI Common Stock	(22)	(38)	0
Payments on Purchase Contracts	(16)	(16)	0
Net cash (used) provided by financing activities	(340)	(264)	48
Cash, cash equivalents and restricted cash (decrease) increase	(13)	6	(53)
Cash and cash equivalents:
Cash, cash equivalents and restricted cash at end of year	7	20	14
Cash, cash equivalents and restricted cash at beginning of year	20	14	67
Cash and cash equivalents (decrease) increase	(13)	6	(53)
Dividends from unconsolidated subsidiaries	$ 680	$ 506	$ 354