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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
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Mar. 31, 2025 | Mar. 31, 2024
Houston Electric |  |
Related Party Transaction [Line Items] |  |
Interest income, net | $ 2 | $ 3
CERC |  |
Related Party Transaction [Line Items] |  |
Interest income, net | $ 1 | $ 0

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