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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to NCI [Roll Forward]:
Balance, beginning of year	$ 5,531	$ 4,137
Other comprehensive income (loss) before reclassification adjustments	(249)	(13)	$ 58
Amounts reclassified from AOCI	9	20	12
Other comprehensive income (loss) attributable to UGI	(240)	7	70
Balance, end of year	6,074	5,531	4,137
Postretirement Benefit Plans
AOCI Including Portion Attributable to NCI [Roll Forward]:
Balance, beginning of year	(17)	(26)	(26)
Other comprehensive income (loss) before reclassification adjustments	28	7	(3)
Amounts reclassified from AOCI	3	2	3
Other comprehensive income (loss) attributable to UGI	31	9	0
Balance, end of year	14	(17)	(26)
Derivative Instruments
AOCI Including Portion Attributable to NCI [Roll Forward]:
Balance, beginning of year	(33)	(54)	(25)
Other comprehensive income (loss) before reclassification adjustments	64	3	(38)
Amounts reclassified from AOCI	6	18	9
Other comprehensive income (loss) attributable to UGI	70	21	(29)
Balance, end of year	37	(33)	(54)
Foreign Currency
AOCI Including Portion Attributable to NCI [Roll Forward]:
Balance, beginning of year	(90)	(67)	(166)
Other comprehensive income (loss) before reclassification adjustments	(341)	(23)	99
Amounts reclassified from AOCI	0	0	0
Other comprehensive income (loss) attributable to UGI	(341)	(23)	99
Balance, end of year	(431)	(90)	(67)
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to NCI [Roll Forward]:
Balance, beginning of year	(140)	(147)	(217)
Balance, end of year	$ (380)	$ (140)	$ (147)

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