Cover Page - shares	9 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-1398
Entity Registrant Name	UGI UTILITIES, INC.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-1174060
Entity Address, Address Line One	One UGI Drive
Entity Address, City or Town	Denver
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	17517
City Area Code	610
Local Phone Number	796-3400
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		26,781,785
Entity Central Index Key	0000100548
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--09-30