Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Sep. 30, 2025

Equity [Abstract]

Schedule of Changes in AOCI

The tables below present changes in AOCI, net of tax:

	Postretirement Benefit Plans		Derivative Instruments		Foreign Currency		Total
AOCI - September 30, 2022	$	14	$	37	$	(431)	$	(380)
Other comprehensive income (loss) before reclassification adjustments	5		16		132		153
Amounts reclassified from AOCI	(2)		(27)		—		(29)
Other comprehensive income (loss) attributable to UGI	3		(11)		132		124
AOCI - September 30, 2023	$	17	$	26	$	(299)	$	(256)
Other comprehensive income (loss) before reclassification adjustments	(7)		(14)		56		35
Amounts reclassified from AOCI	—		(35)		3		(32)
Other comprehensive income (loss) attributable to UGI	(7)		(49)		59		3
AOCI - September 30, 2024	$	10	$	(23)	$	(240)	$	(253)
Other comprehensive income (loss) before reclassification adjustments	13		10		59		82
Amounts reclassified from AOCI	—		(2)		—		(2)
Other comprehensive income (loss) attributable to UGI	13		8		59		80
AOCI - September 30, 2025	$	23	$	(15)	$	(181)	$	(173)