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Income Taxes - Narrative (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Business Acquisition [Line Items]  
Gross state NOL carryforwards $ 2,100
Accrued penalties and interest 32
Unrecognized tax benefits that would impact effective tax rate 25
Accrued penalties and interest not included 7
Decrease in unrecognized tax benefits, including penalties and interest, in the next 12 months 10
CERC  
Business Acquisition [Line Items]  
Gross state NOL carryforwards 1,200
State and Local Jurisdiction  
Business Acquisition [Line Items]  
Deferred tax assets tax credit carryforwards 3
State and Local Jurisdiction | CERC  
Business Acquisition [Line Items]  
Deferred tax assets tax credit carryforwards 3
Operating loss carryforwards 101,000
State and Local Jurisdiction | Houston Electric  
Business Acquisition [Line Items]  
Operating loss carryforwards 48
Federal Tax Jurisdiction  
Business Acquisition [Line Items]  
Deferred tax assets tax credit carryforwards 3,300
Operating loss carryforwards 124
Federal Tax Jurisdiction | CERC  
Business Acquisition [Line Items]  
Deferred tax assets tax credit carryforwards 2,300
Federal Tax Jurisdiction | Houston Electric  
Business Acquisition [Line Items]  
Deferred tax assets tax credit carryforwards 1,700
Federal Charitable Contribution  
Business Acquisition [Line Items]  
Deferred tax assets tax credit carryforwards $ 51