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Related Party Transactions (Houston Electric and CERC) - Schedule of Affiliated-Related Net Interest Income (Expense) (Details) - Other Nonoperating Income (Expense) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Houston Electric |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest income (expense), net | $ (2) | $ 5 | $ 0 | $ 8
CERC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest income (expense), net | $ 9 | $ 1 | $ 10 | $ 1

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