| Cover Page Cover Page | Aug. 05, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Aug. 5, 2019 |
| Entity Registrant Name | UGI Utilities, Inc |
| Entity Central Index Key | 0000100548 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | PA |
| Entity File Number | 1-1398 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
