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Related Party Transactions (Houston Electric and CERC) - Schedule of Money Pool Activity (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Houston Electric |  |
Related Party Transaction [Line Items] |  |
Money pool investments | $ 368 | $ 238
Houston Electric | Investments |  |
Related Party Transaction [Line Items] |  |
Weighted average interest rate | 4.65% | 5.59%
CERC |  |
Related Party Transaction [Line Items] |  |
Money pool investments | $ 0 | $ 1
CERC | Investments |  |
Related Party Transaction [Line Items] |  |
Weighted average interest rate | 0.00% | 5.59%

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