CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Total UGI Corporation stockholders’ equity	Preferred stock, without par value	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests
Balance, beginning of year at Sep. 30, 2018			$ 0	$ 1,201	$ 2,611	$ (110)	$ (20)	$ 419
Balance, beginning of year (ASC 606) at Sep. 30, 2018					(7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock issued in connection with employee and director plans, net of tax withheld				11
Equity-based compensation expense				15
AmeriGas Merger-related adjustments				170				(199)
Net income including noncontrolling interests	$ 308				256			52
Cash dividends on common stock ($1.35, $1.31, and $1.145 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 gains (losses) on derivative instruments						(7)
Reclassification of net losses on derivative instruments	2					2
Benefit plans, principally actuarial gains (losses)	(13)					(13)
Reclassification of benefit plans actuarial losses and net prior service benefits	1					1
Foreign currency (losses) gains on long-term intra-company transactions	(59)					(59)
Foreign currency translation adjustments	(24)					(24)
Common Stock issued in connection with employee and director plans, net of tax withheld							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	0	1,397	2,653	(217)	(16)	10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net gains (losses) on derivative instruments (net of tax of $(1), $15, and $3, respectively)	(7)
Common Stock issued in connection with employee and director plans, net of tax withheld				2
Equity-based compensation expense				17
Net income including noncontrolling interests	532				532
Cash dividends on common stock ($1.35, $1.31, and $1.145 per share, respectively)					(273)
Losses on treasury stock transactions in connection with employee and director plans					(4)
Reclassification of net losses on derivative instruments	9					9
Benefit plans, principally actuarial gains (losses)	(3)					(3)
Reclassification of benefit plans actuarial losses and net prior service benefits	3					3
Foreign currency (losses) gains on long-term intra-company transactions	84					84
Foreign currency translation adjustments	15					15
Common Stock issued in connection with employee and director plans, net of tax withheld							8
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	0	1,416	2,908	(147)	(49)	9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net gains (losses) on derivative instruments (net of tax of $(1), $15, and $3, respectively)	(38)					(38)
Issuance of preferred stock			213	(45)
Common Stock issued in connection with employee and director plans, net of tax withheld				9
Equity-based compensation expense				16
Net income including noncontrolling interests	1,467				1,467
Cash dividends on common stock ($1.35, $1.31, and $1.145 per share, respectively)					(282)
Losses on treasury stock transactions in connection with employee and director plans					(12)
Reclassification of net losses on derivative instruments	18					18
Benefit plans, principally actuarial gains (losses)	7					7
Reclassification of benefit plans actuarial losses and net prior service benefits	2					2
Foreign currency (losses) gains on long-term intra-company transactions	(12)					(12)
Foreign currency translation adjustments	(11)					(11)
Common Stock issued in connection with employee and director plans, net of tax withheld							24
Reacquired common stock – employee and director plans							(1)
Other				(2)
Balance, end of year at Sep. 30, 2021	5,531	$ 5,522	$ 213	$ 1,394	$ 4,081	(140)	$ (26)	$ 9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net gains (losses) on derivative instruments (net of tax of $(1), $15, and $3, respectively)	$ 3					$ 3