Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Goodwill
Balance at beginning of period	$ 3,770	$ 3,518
Acquisitions		261
Purchase accounting adjustments	(5)	1
Foreign currency translation	(153)	(10)
Balance at end of period	3,612	3,770
AmeriGas Propane
Goodwill
Balance at beginning of period	2,004	2,004
Acquisitions		0
Purchase accounting adjustments	0	0
Foreign currency translation	0	0
Balance at end of period	2,004	2,004
UGI International
Goodwill
Balance at beginning of period	993	997
Acquisitions		6
Purchase accounting adjustments	0	0
Foreign currency translation	(153)	(10)
Balance at end of period	840	993
Midstream & Marketing
Goodwill
Balance at beginning of period	336	335
Acquisitions		0
Purchase accounting adjustments	0	1
Foreign currency translation	0	0
Balance at end of period	336	336
Utilities
Goodwill
Balance at beginning of period	437	182
Acquisitions		255
Purchase accounting adjustments	(5)	0
Foreign currency translation	0	0
Balance at end of period	$ 432	$ 437