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Commitments and Contingencies - Legal, Environmental and Other Matters (Details)
$ in Thousands
 1 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
gasManufacturingAndStorageSite
formerAffiliate
lawsuit
insurer
Apr. 02, 2024
lawsuit
Sep. 30, 2024
USD ($)
gasManufacturingAndStorageSite
formerAffiliate
lawsuit
insurer
Sep. 30, 2024
USD ($)
gasManufacturingAndStorageSite
formerAffiliate
lawsuit
Defendant
ashPond
insurer
Apr. 02, 2024
Plaintiff
Feb. 07, 2024
USD ($)
Feb. 02, 2024
lawsuit
Feb. 28, 2023
lawsuit
class
Long-Term Purchase Commitment [Line Items]                
Number of owned coal ash ponds | ashPond       3        
Asset retirement obligation | $ $ 119,000   $ 119,000 $ 119,000        
F.B. Culley                
Long-Term Purchase Commitment [Line Items]                
Number of owned coal ash ponds | ashPond       2        
A.B. Brown                
Long-Term Purchase Commitment [Line Items]                
Number of owned coal ash ponds | ashPond       1        
F.B. Culley East                
Long-Term Purchase Commitment [Line Items]                
Number of owned coal ash ponds | ashPond       1        
Accounting and ratemaking project relief, approved capital costs | $           $ 52,000    
Accounting and ratemaking project relief, approved annual O & M expenses | $           $ 133    
Indiana Gas Service Territory                
Long-Term Purchase Commitment [Line Items]                
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite 26   26 26        
Environmental remediation investigation studies agreed upon number of sites | gasManufacturingAndStorageSite 1   1 1        
SIGECO                
Long-Term Purchase Commitment [Line Items]                
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite 5   5 5        
Minnesota and Indiana                
Long-Term Purchase Commitment [Line Items]                
Environmental remediation, number of sites sites owned or operated by bormer affiliate | formerAffiliate 1   1 1        
CERC | Indiana Gas Service Territory                
Long-Term Purchase Commitment [Line Items]                
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite 26   26 26        
Indiana Electric                
Long-Term Purchase Commitment [Line Items]                
Asset retirement obligation | $ $ 11,000   $ 11,000 $ 11,000        
Property, plant and equipment increase | $     11,000          
Indiana Electric | Minimum                
Long-Term Purchase Commitment [Line Items]                
Estimated capital expenditure to clean ash ponds | $ 60,000   60,000 60,000        
Indiana Electric | Maximum                
Long-Term Purchase Commitment [Line Items]                
Estimated capital expenditure to clean ash ponds | $ $ 80,000   $ 80,000 $ 80,000        
Loss from Catastrophes                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits               12
Loss from Catastrophes | Harris County                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits               9
Uninsured Risk                
Long-Term Purchase Commitment [Line Items]                
Loss contingency, number of insurers | insurer 1   1 1        
Hurricane Beryl | Pending Litigation | CenterPoint Energy And Houston Electric Entities                
Long-Term Purchase Commitment [Line Items]                
Loss contingency, new claims filed, number       3        
Hurricane Beryl Class Action 1 | Pending Litigation | CenterPoint Energy And Houston Electric Entities                
Long-Term Purchase Commitment [Line Items]                
Loss contingency, damages sought, value | $ $ 100,000              
Hurricane Beryl Class Action 3 | Pending Litigation | CenterPoint Energy And Houston Electric Entities                
Long-Term Purchase Commitment [Line Items]                
Loss contingency, damages sought, value | $ 100,000              
Hurricane Beryl Class Action 2 | Pending Litigation | CenterPoint Energy And Houston Electric Entities                
Long-Term Purchase Commitment [Line Items]                
Loss contingency, damages sought, value | $ 100,000              
Hurricane Beryl Personal Injury | Pending Litigation | CenterPoint Energy And Houston Electric Entities                
Long-Term Purchase Commitment [Line Items]                
Restore the electric delivery facility cost | $ $ 1,000   $ 1,000 $ 1,000        
Litigation Related to the February 2021 Winter Storm Event | Pending Litigation                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 220   220 220        
February 2021 Winter Storm Event | Pending Litigation | CenterPoint Energy And Houston Electric Entities                
Long-Term Purchase Commitment [Line Items]                
Loss contingency, pending claims, number of lawsuits named as defendant       155        
Multi District Litigation | February 2021 Putative Class Action                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 1   1 1        
Multi District Litigation | February 2021 Putative Class Action | Utility Holding, LLC                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 1   1 1        
Multi District Litigation | Cases Transferred to the Multi District Litigation (MDL)                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 3 3 3 3 3   3  
Multi District Litigation | Cases Transferred to the Multi District Litigation (MDL) | CES                
Long-Term Purchase Commitment [Line Items]                
Number of claims dismissed   3            
Bellwether Cases | Pending Litigation                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 5   5 5        
Harris County vs. CERC - Putative | Loss from Catastrophes                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits               1
Number of classes of electric and natural gas customers | class               2
Other Texas Lawsuits Brought By Assignee vs. Company | Loss from Catastrophes                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits               2
Other Texas Lawsuits Brought By Assignee vs. Company | Loss from Catastrophes | Harris County                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits               1
Other Texas Lawsuits Brought By Assignee vs. Company | Loss from Catastrophes | Tom Green County                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits               1
Multi District Litigation (MDL) Proceeding | Cases Transferred to the Multi District Litigation (MDL) | Harris County                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 9   9 9        
Jefferson Parish and the State of Louisiana Under the SCLRMA | Pending Litigation                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 42   42 42        
Jefferson Parish and the State of Louisiana Under the SCLRMA | Suits Remanded to Louisiana Federal Couts                
Long-Term Purchase Commitment [Line Items]                
Pending lawsuits 42   42 42        
Jefferson Parish | Pending Litigation | Predecessor Company, Primary Fuels, Inc.                
Long-Term Purchase Commitment [Line Items]                
Loss contingency, pending claims, number of lawsuits named as defendant | Defendant       1        
Loss contingency, number of defendants       1