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Related Party Transactions (Houston Electric and CERC) - Schedule of Transactions (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Houston Electric |  |
Related Party Transaction [Line Items] |  |
Cash dividends paid to parent | $ 90 | $ 36
Houston Electric | Additional Paid-in-Capital |  |
Related Party Transaction [Line Items] |  |
Contribution from parent | 0 | 230
CERC |  |
Related Party Transaction [Line Items] |  |
Cash dividends paid to parent | 97 | 115
CERC | Additional Paid-in-Capital |  |
Related Party Transaction [Line Items] |  |
Contribution from parent | $ 0 | $ 0

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