| Document and Entity Information | Oct. 30, 2024 |
| Cover [Abstract] | |
| Entity Registrant Name | CENTERPOINT ENERGY HOUSTON ELECTRIC LLC |
| Trading Symbol | CNP |
| Amendment Flag | false |
| Entity Central Index Key | 0000048732 |
| No Trading Symbol Flag | true |
| Document Type | 8-K |
| Document Period End Date | Oct. 30, 2024 |
| Entity Incorporation State Country Code | TX |
| Entity File Number | 1-3187 |
| Entity Tax Identification Number | 22-3865106 |
| Entity Address, Address Line One | 1111 Louisiana |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77002 |
| City Area Code | (713) |
| Local Phone Number | 207-1111 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | 6.95% General Mortgage Bonds due 2033 |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
