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Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Regulatory Asset [Abstract] |  |
Total Regulatory Assets | $ 3,347 | $ 2,674
Total Current Regulatory Assets | 239 | 161
Regulatory assets | 3,108 | 2,513
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 3,047 | 3,247
Total Current Regulatory Liabilities | 48 | 39
Regulatory liabilities | 2,999 | 3,208
Regulatory liabilities related to TCJA |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 1,346 | 1,377
Estimated removal costs |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 1,247 | 1,322
Other regulatory assets |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 454 | 548
Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 1,284 | 752
Total Current Regulatory Assets | 0 | 0
Regulatory assets | 1,284 | 752
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 868 | 1,031
Total Current Regulatory Liabilities | 7 | 6
Regulatory liabilities | 861 | 1,025
Houston Electric | Regulatory liabilities related to TCJA |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 673 | 695
Houston Electric | Estimated removal costs |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 0 | 91
Houston Electric | Other regulatory assets |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 195 | 245
CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 1,141 | 1,011
Total Current Regulatory Assets | 238 | 161
Regulatory assets | 903 | 850
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 1,927 | 1,915
Total Current Regulatory Liabilities | 40 | 33
Regulatory liabilities | 1,887 | 1,882
CERC | Regulatory liabilities related to TCJA |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 501 | 505
CERC | Estimated removal costs |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 1,191 | 1,150
CERC | Other regulatory assets |  |
Regulatory Liability [Abstract] |  |
Total Regulatory Liabilities | 235 | 260
Future amounts recoverable from ratepayers related to: |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 821 | 765
Future amounts recoverable from ratepayers related to: | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 127 | 116
Future amounts recoverable from ratepayers related to: | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 261 | 233
Future amounts recoverable from ratepayers related to: | Benefit obligations |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 373 | 379
Future amounts recoverable from ratepayers related to: | Benefit obligations | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Future amounts recoverable from ratepayers related to: | Benefit obligations | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 4 | 5
Future amounts recoverable from ratepayers related to: | Asset retirement obligations & other |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 304 | 290
Future amounts recoverable from ratepayers related to: | Asset retirement obligations & other | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 80 | 75
Future amounts recoverable from ratepayers related to: | Asset retirement obligations & other | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 188 | 186
Future amounts recoverable from ratepayers related to: | Net deferred income taxes |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 144 | 96
Future amounts recoverable from ratepayers related to: | Net deferred income taxes | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 47 | 41
Future amounts recoverable from ratepayers related to: | Net deferred income taxes | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 69 | 42
Amounts deferred for future recovery related to: |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 998 | 450
Amounts deferred for future recovery related to: | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 789 | 199
Amounts deferred for future recovery related to: | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 139 | 203
Amounts deferred for future recovery related to: | Cost recovery riders |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 145 | 113
Amounts deferred for future recovery related to: | Cost recovery riders | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts deferred for future recovery related to: | Cost recovery riders | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 83 | 73
Amounts deferred for future recovery related to: | Hurricane Harvey restoration costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 145 | 149
Amounts deferred for future recovery related to: | Hurricane Harvey restoration costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 145 | 123
Amounts deferred for future recovery related to: | Hurricane Harvey restoration costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 26
Amounts deferred for future recovery related to: | May 2024 Storm Events |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 86 |
Amounts deferred for future recovery related to: | May 2024 Storm Events | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 86 |
Amounts deferred for future recovery related to: | May 2024 Storm Events | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 |
Amounts deferred for future recovery related to: | Hurricane Beryl |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 458 |
Amounts deferred for future recovery related to: | Hurricane Beryl | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 458 |
Amounts deferred for future recovery related to: | Hurricane Beryl | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 |
Amounts deferred for future recovery related to: | Hurricane Francine |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 19 |
Amounts deferred for future recovery related to: | Hurricane Francine | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 19 |
Amounts deferred for future recovery related to: | Hurricane Francine | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 |
Amounts deferred for future recovery related to: | Other regulatory assets |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 177 | 147
Amounts deferred for future recovery related to: | Other regulatory assets | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 87 | 59
Amounts deferred for future recovery related to: | Other regulatory assets | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 74 | 72
Amounts deferred for future recovery related to: | Gas recovery costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets |  | 27
Amounts deferred for future recovery related to: | Gas recovery costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets |  | 0
Amounts deferred for future recovery related to: | Gas recovery costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets |  | 27
Amounts deferred for future recovery related to: | Decoupling |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 12 | 17
Amounts deferred for future recovery related to: | Decoupling | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts deferred for future recovery related to: | Decoupling | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 12 | 17
Amounts deferred for future recovery related to: | COVID-19 incremental costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets |  | 12
Amounts deferred for future recovery related to: | COVID-19 incremental costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets |  | 8
Amounts deferred for future recovery related to: | COVID-19 incremental costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets |  | 4
Amounts deferred for future recovery related to: | Temporary generation costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 71 | 48
Amounts deferred for future recovery related to: | Temporary generation costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 71 | 48
Amounts deferred for future recovery related to: | Temporary generation costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts deferred for future recovery related to: | Unrecognized equity return |  |
Regulatory Asset [Abstract] |  |
Unrecognized equity return | (115) | (63)
Amounts deferred for future recovery related to: | Unrecognized equity return | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Unrecognized equity return | (77) | (39)
Amounts deferred for future recovery related to: | Unrecognized equity return | CERC |  |
Regulatory Asset [Abstract] |  |
Unrecognized equity return | (30) | (16)
Amounts currently recovered in customer rates related to: |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 1,528 | 1,459
Amounts currently recovered in customer rates related to: | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 368 | 437
Amounts currently recovered in customer rates related to: | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 741 | 575
Amounts currently recovered in customer rates related to: | Benefit obligations |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 4 | 11
Amounts currently recovered in customer rates related to: | Benefit obligations | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 4 | 11
Amounts currently recovered in customer rates related to: | Benefit obligations | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts currently recovered in customer rates related to: | Hurricane Harvey restoration costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 31 | 17
Amounts currently recovered in customer rates related to: | Hurricane Harvey restoration costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 5 | 17
Amounts currently recovered in customer rates related to: | Hurricane Harvey restoration costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 26 | 0
Amounts currently recovered in customer rates related to: | Other regulatory assets |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 34 |
Amounts currently recovered in customer rates related to: | Other regulatory assets | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 |
Amounts currently recovered in customer rates related to: | Other regulatory assets | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 34 |
Amounts currently recovered in customer rates related to: | Gas recovery costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 122 | 34
Amounts currently recovered in customer rates related to: | Gas recovery costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts currently recovered in customer rates related to: | Gas recovery costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 122 | 34
Amounts currently recovered in customer rates related to: | Decoupling |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 38 |
Amounts currently recovered in customer rates related to: | Decoupling | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 |
Amounts currently recovered in customer rates related to: | Decoupling | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 38 |
Amounts currently recovered in customer rates related to: | Temporary generation costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 219 | 208
Amounts currently recovered in customer rates related to: | Temporary generation costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 219 | 208
Amounts currently recovered in customer rates related to: | Temporary generation costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts currently recovered in customer rates related to: | Unrecognized equity return |  |
Regulatory Asset [Abstract] |  |
Unrecognized equity return | (136) | (141)
Amounts currently recovered in customer rates related to: | Unrecognized equity return | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Unrecognized equity return | (17) | (36)
Amounts currently recovered in customer rates related to: | Unrecognized equity return | CERC |  |
Regulatory Asset [Abstract] |  |
Unrecognized equity return | (62) | (53)
Amounts currently recovered in customer rates related to: | Authorized trackers and cost deferrals |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 600 | 535
Amounts currently recovered in customer rates related to: | Authorized trackers and cost deferrals | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 47 | 44
Amounts currently recovered in customer rates related to: | Authorized trackers and cost deferrals | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 440 | 375
Amounts currently recovered in customer rates related to: | Securitized regulatory assets |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 343 | 434
Amounts currently recovered in customer rates related to: | Securitized regulatory assets | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 74
Amounts currently recovered in customer rates related to: | Securitized regulatory assets | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts currently recovered in customer rates related to: | Unamortized loss on reacquired debt and hedging |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 93 | 106
Amounts currently recovered in customer rates related to: | Unamortized loss on reacquired debt and hedging | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 63 | 72
Amounts currently recovered in customer rates related to: | Unamortized loss on reacquired debt and hedging | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 10 | 11
Amounts currently recovered in customer rates related to: | Extraordinary gas costs |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 133 | 208
Amounts currently recovered in customer rates related to: | Extraordinary gas costs | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | 0
Amounts currently recovered in customer rates related to: | Extraordinary gas costs | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 133 | 208
Amounts currently recovered in customer rates related to: | Regulatory assets related to TCJA |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 47 | 47
Amounts currently recovered in customer rates related to: | Regulatory assets related to TCJA | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 47 | 47
Amounts currently recovered in customer rates related to: | Regulatory assets related to TCJA | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 0 | $ 0
Amounts currently recovered in customer earning a return |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 463 |
Amounts currently recovered in customer earning a return | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 305 |
Amounts currently recovered in customer earning a return | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | 158 |
Amounts currently recovered in customer not earning a return |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | $ 424 |
Regulatory Liability [Abstract] |  |
Remaining weighted average period for which no return on investment during recovery period is provided | 11 years |
Amounts currently recovered in customer not earning a return | Houston Electric |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | $ 63 |
Regulatory Liability [Abstract] |  |
Remaining weighted average period for which no return on investment during recovery period is provided | 27 years |
Amounts currently recovered in customer not earning a return | CERC |  |
Regulatory Asset [Abstract] |  |
Total Regulatory Assets | $ 328 |
Regulatory Liability [Abstract] |  |
Remaining weighted average period for which no return on investment during recovery period is provided | 7 years |

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