CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Total UGI stockholders’ equity	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests
Balance, beginning of period at Sep. 30, 2019			$ 1,397	$ 2,653	$ (217)	$ (16)	$ 10
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans, net of tax withheld			2
Equity-based compensation expense			11
Losses on common stock transactions in connection with employee and director plans				(3)
Net income attributable to UGI Corporation	$ 438			438
Cash dividends on UGI Common Stock ($0.33, $0.325, $0.66, and $0.650, respectively)				(136)
Net gains (losses) on derivative instruments	(30)				(30)
Reclassification of net losses on derivative instruments	1				1
Benefit plans	2				2
Foreign currency adjustments	14				14
Common Stock issued in connection with employee and director plans, net of tax withheld						4
Repurchases of UGI Common Stock						(38)
Reacquired UGI Common Stock - employee and director plans						(1)
Other			(1)	1			(1)
Balance, end of period at Mar. 31, 2020	4,090	$ 4,081	1,409	2,953	(230)	(51)	9
Balance, beginning of period at Dec. 31, 2019			1,398	2,798	(163)	(37)	9
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans, net of tax withheld			2
Equity-based compensation expense			9
Losses on common stock transactions in connection with employee and director plans				(3)
Net income attributable to UGI Corporation	226			226
Cash dividends on UGI Common Stock ($0.33, $0.325, $0.66, and $0.650, respectively)				(68)
Net gains (losses) on derivative instruments	(36)				(36)
Reclassification of net losses on derivative instruments	0
Benefit plans	2				2
Foreign currency adjustments	(33)				(33)
Common Stock issued in connection with employee and director plans, net of tax withheld						2
Repurchases of UGI Common Stock						(15)
Reacquired UGI Common Stock - employee and director plans						(1)
Balance, end of period at Mar. 31, 2020	4,090	4,081	1,409	2,953	(230)	(51)	9
Balance, beginning of period at Sep. 30, 2020	4,137		1,416	2,908	(147)	(49)	9
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans, net of tax withheld			3
Equity-based compensation expense			9
Losses on common stock transactions in connection with employee and director plans				(5)
Net income attributable to UGI Corporation	792			792
Cash dividends on UGI Common Stock ($0.33, $0.325, $0.66, and $0.650, respectively)				(138)
Net gains (losses) on derivative instruments	4				4
Reclassification of net losses on derivative instruments	9				9
Benefit plans	1				1
Foreign currency adjustments	7				7
Common Stock issued in connection with employee and director plans, net of tax withheld						10
Reacquired UGI Common Stock - employee and director plans						(1)
Balance, end of period at Mar. 31, 2021	4,828	4,819	1,428	3,557	(126)	(40)	9
Balance, beginning of period at Dec. 31, 2020			1,419	3,139	(79)	(42)	9
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans, net of tax withheld			2
Equity-based compensation expense			7
Losses on common stock transactions in connection with employee and director plans				(2)
Net income attributable to UGI Corporation	489			489
Cash dividends on UGI Common Stock ($0.33, $0.325, $0.66, and $0.650, respectively)				(69)
Net gains (losses) on derivative instruments	4				4
Reclassification of net losses on derivative instruments	4				4
Benefit plans	1				1
Foreign currency adjustments	(56)				(56)
Common Stock issued in connection with employee and director plans, net of tax withheld						3
Reacquired UGI Common Stock - employee and director plans						(1)
Balance, end of period at Mar. 31, 2021	$ 4,828	$ 4,819	$ 1,428	$ 3,557	$ (126)	$ (40)	$ 9