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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 | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Interest income (expense), net | $ 2 | $ 0 | $ 0
CERC Corp |  |  |
Related Party Transaction [Line Items] |  |  |
Interest income (expense), net | $ 10 | $ (18) | $ (38)

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