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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 12, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-31447    
Entity Registrant Name CenterPoint Energy, Inc.    
Entity Tax Identification Number 74-0694415    
Entity Incorporation, State or Country Code TX    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 18,251,183,835
Entity Common Stock, Shares Outstanding   631,594,706  
Documents Incorporated by Reference
Portions of the definitive proxy statement relating to the 2024 Annual Meeting of Shareholders of CenterPoint Energy, which will be filed with the Securities and Exchange Commission within 120 days of December 31, 2023, are incorporated by reference in Item 10, Item 11, Item 12, Item 13 and Item 14 of Part III of this Form 10-K.
    
Entity Central Index Key 0001130310    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock, $0.01 par value | New York Stock Exchange      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol CNP    
Security Exchange Name NYSE    
Common Stock, $0.01 par value | NYSE Chicago      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol CNP    
Security Exchange Name CHX    
CenterPoint Energy Houston Electric, LLC      
Entity Information [Line Items]      
Entity File Number 1-3187    
Entity Registrant Name CenterPoint Energy Houston Electric, LLC    
Entity Tax Identification Number 22-3865106    
Entity Incorporation, State or Country Code TX    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     0
Entity Common Stock, Shares Outstanding   1,000  
Entity Central Index Key 0000048732    
CenterPoint Energy Houston Electric, LLC | 6.95% General Mortgage Bonds due 2033 | New York Stock Exchange      
Entity Information [Line Items]      
Title of 12(b) Security 6.95% General Mortgage Bonds due 2033    
Security Exchange Name NYSE    
No Trading Symbol Flag true    
CenterPoint Energy Resources Corp.      
Entity Information [Line Items]      
Entity File Number 1-13265    
Entity Registrant Name CenterPoint Energy Resources Corp.    
Entity Tax Identification Number 76-0511406    
Entity Incorporation, State or Country Code DE    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   1,000  
Entity Central Index Key 0001042773    
CenterPoint Energy Resources Corp. | 6.625% Senior Notes due 2037 | New York Stock Exchange      
Entity Information [Line Items]      
Title of 12(b) Security 6.625% Senior Notes due 2037    
Security Exchange Name NYSE    
No Trading Symbol Flag true