CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Total UGI Corporation stockholders’ equity	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests
Balance, beginning of year at Sep. 30, 2017			$ 1,189	$ 2,107	$ (93)	$ (39)	$ 578
Common stock issued:
Employee and director plans (including losses on treasury stock transactions), net of tax withheld			(2)
Employee and director plans, net of tax withheld						87
Equity-based compensation expense			14
Net income including noncontrolling interests	$ 822			719			103
Cash dividends on common stock ($1.31, $1.145, and $1.02 per share, respectively)				(177)
Losses on treasury stock transactions in connection with employee and director plans				(38)
Net (losses) gains on derivative instruments	1				1
Reclassification of net losses on derivative instruments	4				4
Benefit plans, principally actuarial (losses) gains	10				10
Reclassification of benefit plans actuarial losses and net prior service benefits	(2)				(2)
Foreign currency gains (losses) on long-term intra-company transactions	(9)				(9)
Foreign currency translation adjustments	(21)				(21)
Repurchases of common stock						(60)
Reacquired common stock – employee and director plans						(8)
Dividends and distributions							(263)
Other							1
Balance, end of year at Sep. 30, 2018	$ 4,101	$ 3,682	1,201	2,611	(110)	(20)	419
Balance, end of year (ASC 606) at Sep. 30, 2018				(7)
Common stock issued:
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
Employee and director plans (including losses on treasury stock transactions), net of tax withheld			11
Employee and director plans, net of tax withheld						24
Equity-based compensation expense			15
AmeriGas Merger-related adjustments			170				(199)
Net income including noncontrolling interests	$ 308			256			52
Cash dividends on common stock ($1.31, $1.145, and $1.02 per share, respectively)				(200)
Reclassification of stranded income tax effects related to TCJA	(7)			7	(7)
Losses on treasury stock transactions in connection with employee and director plans				(14)
Net (losses) gains on derivative instruments	(7)				(7)
Reclassification of net losses on derivative instruments	2				2
Benefit plans, principally actuarial (losses) gains	(13)				(13)
Reclassification of benefit plans actuarial losses and net prior service benefits	1				1
Foreign currency gains (losses) on long-term intra-company transactions	(59)				(59)
Foreign currency translation adjustments	(24)				(24)
Repurchases of common stock						(17)
Reacquired common stock – employee and director plans						(3)
Dividends and distributions							(263)
Other							1
Balance, end of year at Sep. 30, 2019	3,827	3,817	1,397	2,653	(217)	(16)	10
Common stock issued:
Employee and director plans (including losses on treasury stock transactions), net of tax withheld			2
Employee and director plans, net of tax withheld						8
Equity-based compensation expense			17
Net income including noncontrolling interests	532			532
Cash dividends on common stock ($1.31, $1.145, and $1.02 per share, respectively)				(273)
Losses on treasury stock transactions in connection with employee and director plans				(4)
Net (losses) gains on derivative instruments					(38)
Reclassification of net losses on derivative instruments	9				9
Benefit plans, principally actuarial (losses) gains	(3)				(3)
Reclassification of benefit plans actuarial losses and net prior service benefits	3				3
Foreign currency gains (losses) on long-term intra-company transactions	84				84
Foreign currency translation adjustments	15				15
Repurchases of common stock						(38)
Reacquired common stock – employee and director plans						(3)
Other							(1)
Balance, end of year at Sep. 30, 2020	$ 4,137	$ 4,128	$ 1,416	$ 2,908	$ (147)	$ (49)	$ 9