Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Feb. 12, 2019
Jun. 30, 2018
Entity Information [Line Items]   
Entity Registrant NameCENTERPOINT ENERGY INC  
Entity Central Index Key0001130310  
Current Fiscal Year End Date--12-31  
Entity Filer CategoryLarge Accelerated Filer  
Document Type10-K  
Document Period End DateDec. 31, 2018  
Document Fiscal Year Focus2018  
Document Fiscal Period FocusFY  
Amendment Flagfalse  
Entity Common Stock, Shares Outstanding 501,206,304 
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Public Float  $ 11,873,304,802
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
Houston Electric [Member]   
Entity Information [Line Items]   
Entity Registrant NameCENTERPOINT ENERGY HOUSTON ELECTRIC LLC  
Entity Central Index Key0000048732  
Current Fiscal Year End Date--12-31  
Entity Filer CategoryNon-accelerated Filer  
Document Type10-K  
Document Period End DateDec. 31, 2018  
Document Fiscal Year Focus2018  
Document Fiscal Period FocusFY  
Amendment Flagfalse  
Entity Common Stock, Shares Outstanding 1,000 
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Public Float  0
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
CERC Corp [Member]   
Entity Information [Line Items]   
Entity Registrant NameCENTERPOINT ENERGY RESOURCES CORP  
Entity Central Index Key0001042773  
Current Fiscal Year End Date--12-31  
Entity Filer CategoryNon-accelerated Filer  
Document Type10-K  
Document Period End DateDec. 31, 2018  
Document Fiscal Year Focus2018  
Document Fiscal Period FocusFY  
Amendment Flagfalse  
Entity Common Stock, Shares Outstanding 1,000 
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Public Float  $ 0
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
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