SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) - BALANCE SHEETS (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Current assets
Cash and cash equivalents	$ 405	$ 855	$ 336
Prepaid expenses and other current assets	120	101
Total current assets	3,802	3,270
Other assets	755	831
Total assets	17,575	16,723	$ 13,985
Current liabilities
Current maturities of long-term debt	149	110
Total current liabilities	2,444	2,297
Long-term debt	6,483	6,339
Other noncurrent liabilities	1,219	1,381
Total liabilities	11,501	11,192
Commitments and contingencies (Note 1)
Equity:
Preferred Stock, without par value (authorized 5,000,000 shares; issued 220,000 and 220,000 Series A shares, respectively)	162	213
Common Stock, without par value (authorized – 450,000,000 shares; issued – 210,560,494 and 209,843,296 shares, respectively)	1,483	1,394
Retained earnings	4,841	4,081
Accumulated other comprehensive loss	(380)	(140)
Treasury stock, at cost	(40)	(26)
Total UGI Corporation stockholders’ equity	6,066	5,522
Total liabilities and equity	$ 17,575	$ 16,723
Condensed Financial Information of Registrant [Abstract]
UGI Preferred Stock, without par value, shares authorized (in shares)	5,000,000	5,000,000
Preferred Stock, shares issued (in shares)	220,000	220,000
Common Stock, shares authorized (in shares)	450,000,000	450,000,000
Common Stock, shares issued (in shares)	210,560,494	209,843,296
Parent Company
Current assets
Cash and cash equivalents	$ 20	$ 14
Accounts receivable – related parties	24	18
Prepaid expenses and other current assets	20	11
Total current assets	64	43
Property, plant and equipment, net	1	2
Investments in subsidiaries	7,035	6,479
Other assets	97	107
Total assets	7,197	6,631
Current liabilities
Current maturities of long-term debt	125	70
Accounts and notes payable	20	24
Accrued liabilities	51	62
Total current liabilities	196	156
Long-term debt	889	875
Other noncurrent liabilities	46	78
Total liabilities	1,131	1,109
Commitments and contingencies (Note 1)
Equity:
Preferred Stock, without par value (authorized 5,000,000 shares; issued 220,000 and 220,000 Series A shares, respectively)	162	213
Common Stock, without par value (authorized – 450,000,000 shares; issued – 210,560,494 and 209,843,296 shares, respectively)	1,483	1,394
Retained earnings	4,841	4,081
Accumulated other comprehensive loss	(380)	(140)
Treasury stock, at cost	(40)	(26)
Total UGI Corporation stockholders’ equity	6,066	5,522
Total liabilities and equity	$ 7,197	$ 6,631
Condensed Financial Information of Registrant [Abstract]
Common Stock, shares authorized (in shares)	450,000,000	450,000,000
Common Stock, shares issued (in shares)	210,560,494	209,843,296