| Document and Entity Information | May 08, 2024 |
| Cover [Abstract] | |
| Entity Registrant Name | CENTERPOINT ENERGY INC |
| Security Exchange Name | NYSE |
| Amendment Flag | false |
| Entity Central Index Key | 0001130310 |
| Document Type | 8-K |
| Document Period End Date | May 08, 2024 |
| Entity Incorporation State Country Code | TX |
| Entity File Number | 1-31447 |
| Entity Tax Identification Number | 74-0694415 |
| 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 | Common Stock, $0.01 par value |
| Trading Symbol | CNP |
| Entity Emerging Growth Company | false |
