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Related Party Transactions (Houston Electric and CERC) - Schedule of Money Pool Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Houston Electric | Investments |  |
Related Party Transaction [Line Items] |  |
Weighted average interest rate | 5.59% | 4.75%
CERC Corp | Investments |  |
Related Party Transaction [Line Items] |  |
Weighted average interest rate | 5.59% | 4.75%
Accounts and notes receivable (payable) - affiliate companies | Houston Electric |  |
Related Party Transaction [Line Items] |  |
Money pool investments (borrowings) | $ 238 | $ (642)
Accounts and notes receivable (payable) - affiliate companies | CERC Corp |  |
Related Party Transaction [Line Items] |  |
Money pool investments (borrowings) | $ 1 | $ 0

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