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Income Taxes - Narrative (Details) $ in Millions | Dec. 31, 2024 USD ($)
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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

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