CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (losses) gains on derivative instruments , tax	$ 0	$ (2)
Tax on reclassification on derivative instruments	(2)	0
Foreign currency adjustments, tax	12	7
Net income attributable to UGI Corporation	$ 303	$ 212