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Income Taxes - Schedule of Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Tax Carryforward [Line Items] |  |  |
Effective tax rate (as a percent) | 16.00% | 16.00% | 25.00%
Income tax reconciliation [Abstract] |  |  |
Income before income taxes | $ 1,214 | $ 1,087 | $ 1,417
Federal statutory income tax rate | 21.00% | 21.00% | 21.00%
Expected federal income tax expense | $ 255 | $ 228 | $ 298
Increase (decrease) in tax expense resulting from: |  |  |
State income tax expense, net of federal income tax | 25 | 25 | 46
State valuation allowance, net of federal income tax | 17 | 0 | 0
State law change, net of federal income tax | (47) | (69) | 0
Equity AFUDC | (12) | (13) | (8)
Excess deferred income tax amortization | (43) | (44) | (51)
Goodwill impairment | 0 | 0 | 84
Sale of Energy Systems Group | 0 | 28 | 0
Other, net | 0 | 15 | (9)
Total | (60) | (58) | 62
Total income tax expense (benefit) | $ 195 | $ 170 | $ 360
Effective tax rate (as a percent) | 16.00% | 16.00% | 25.00%
Net income |  |  |
Increase (decrease) in tax expense resulting from: |  |  |
Equity AFUDC | $ (13) | $ (8) |
Excess deferred income tax amortization | (44) | (51) |
Goodwill impairment |  | $ 84 |
Sale of Energy Systems Group | 28 |  |
Income tax rate reconciliation, state deferred remeasurement, net of federal income tax | $ 69 |  |
Houston Electric |  |  |
Other Tax Carryforward [Line Items] |  |  |
Effective tax rate (as a percent) | 20.00% | 22.00% | 20.00%
Income tax reconciliation [Abstract] |  |  |
Income before income taxes | $ 684 | $ 761 | $ 635
Federal statutory income tax rate | 21.00% | 21.00% | 21.00%
Expected federal income tax expense | $ 144 | $ 160 | $ 133
Increase (decrease) in tax expense resulting from: |  |  |
State income tax expense, net of federal income tax | 12 | 27 | 13
Equity AFUDC | (5) | 0 | 0
Excess deferred income tax amortization | (17) | (17) | (18)
Other, net | 4 | (2) | (3)
Total | (6) | 8 | (8)
Total income tax expense (benefit) | $ 138 | $ 168 | $ 125
Effective tax rate (as a percent) | 20.00% | 22.00% | 20.00%
CERC |  |  |
Other Tax Carryforward [Line Items] |  |  |
Effective tax rate (as a percent) | 16.00% | (5.00%) | 25.00%
Income tax reconciliation [Abstract] |  |  |
Income before income taxes | $ 644 | $ 486 | $ 961
Federal statutory income tax rate | 21.00% | 21.00% | 21.00%
Expected federal income tax expense | $ 135 | $ 102 | $ 202
Increase (decrease) in tax expense resulting from: |  |  |
State income tax expense, net of federal income tax | 19 | (40) | 35
State law change, net of federal income tax | (45) | (66) | 0
Equity AFUDC | (4) | 0 | 0
Excess deferred income tax amortization | (15) | (23) | (28)
Goodwill impairment | 0 | 0 | 30
Other, net | (3) | 1 | (3)
Total | (31) | (128) | 34
Total income tax expense (benefit) | $ 104 | $ (26) | $ 236
Effective tax rate (as a percent) | 16.00% | (5.00%) | 25.00%
CERC | Net income |  |  |
Increase (decrease) in tax expense resulting from: |  |  |
State valuation allowance, net of federal income tax | $ 17 | $ 0 | $ 0
Excess deferred income tax amortization | (15) | (23) | (28)
Goodwill impairment |  |  | $ 30
Income tax rate reconciliation, state deferred remeasurement, net of federal income tax | 45 | $ 66 |
Valuation allowance | 17 |  |
Louisiana and Mississippi NOL |  |  |
Increase (decrease) in tax expense resulting from: |  |  |
Total income tax expense (benefit) | 12 |  |
Louisiana and Mississippi NOL | Net income |  |  |
Increase (decrease) in tax expense resulting from: |  |  |
Equity AFUDC | (17) |  |
Excess deferred income tax amortization | (43) |  |
Income tax rate reconciliation, state deferred remeasurement, net of federal income tax | $ 47 |  |

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