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Related Party Transactions (Houston Electric and CERC) - Schedule of Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Cash dividends paid to parent | $ 339 | $ 367 | $ 316
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses | 0 | 0 | 0
Non-cash capital contribution from parent in payment for property, plant and equipment below | 0 | 0 | 38
Cash paid to parent for property, plant and equipment below | 0 | 0 | 65
Property, plant and equipment from parent | 0 | 0 | 103
Houston Electric | Additional Paid-in-Capital |  |  |
Related Party Transaction [Line Items] |  |  |
Cash contribution from parent | 844 | 885 | 1,143
Net assets acquired in the Restructuring | 0 | 0 | 0
CERC |  |  |
Related Party Transaction [Line Items] |  |  |
Cash dividends paid to parent | 442 | 496 | 124
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses | 0 | 0 | 720
Non-cash capital contribution from parent in payment for property, plant and equipment below | 0 | 0 | 54
Cash paid to parent for property, plant and equipment below | 0 | 0 | 61
Property, plant and equipment from parent | 0 | 0 | 115
CERC | Additional Paid-in-Capital |  |  |
Related Party Transaction [Line Items] |  |  |
Cash contribution from parent | 290 | 500 | 289
Net assets acquired in the Restructuring | $ 0 | $ 0 | $ 2,345

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