Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income

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

Three Months Ended March 31, 2021	Postretirement Benefit Plans		Derivative Instruments		Foreign Currency		Total
AOCI — December 31, 2020	$	(26)	$	(49)	$	(4)	$	(79)
Other comprehensive income (loss) before reclassification adjustments	—		4		(56)		(52)
Amounts reclassified from AOCI	1		4		—		5
Other comprehensive income (loss) attributable to UGI	1		8		(56)		(47)
AOCI — March 31, 2021	$	(25)	$	(41)	$	(60)	$	(126)
Three Months Ended March 31, 2020	Postretirement Benefit Plans		Derivative Instruments		Foreign Currency		Total
AOCI — December 31, 2019	$	(26)	$	(18)	$	(119)	$	(163)
Other comprehensive loss before reclassification adjustments	—		(36)		(33)		(69)
Amounts reclassified from AOCI	2		—		—		2
Other comprehensive income (loss) attributable to UGI	2		(36)		(33)		(67)
AOCI — March 31, 2020	$	(24)	$	(54)	$	(152)	$	(230)

Six Months Ended March 31, 2021	Postretirement Benefit Plans		Derivative Instruments		Foreign Currency		Total
AOCI — September 30, 2020	$	(26)	$	(54)	$	(67)	$	(147)
Other comprehensive income before reclassification adjustments	—		4		7		11
Amounts reclassified from AOCI	1		9		—		10
Other comprehensive income attributable to UGI	1		13		7		21
AOCI — March 31, 2021	$	(25)	$	(41)	$	(60)	$	(126)
Six Months Ended March 31, 2020	Postretirement Benefit Plans		Derivative Instruments		Foreign Currency		Total
AOCI — September 30, 2019	$	(26)	$	(25)	$	(166)	$	(217)
Other comprehensive (loss) income before reclassification adjustments	—		(30)		14		(16)
Amounts reclassified from AOCI	2		1		—		3
Other comprehensive income (loss) attributable to UGI	2		(29)		14		(13)
AOCI — March 31, 2020	$	(24)	$	(54)	$	(152)	$	(230)