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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Significant Accounting Policies [Line Items] |  |  |
Deferred debt interest | $ 65 | $ 51 | $ 26
Houston Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
Deferred debt interest | 16 | 12 | 1
CERC Corp |  |  |
Significant Accounting Policies [Line Items] |  |  |
Deferred debt interest | 43 | 36 | 22
Interest Expense |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized interest and AFUDC debt | 32 | 26 | 18
Interest Expense | Houston Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized interest and AFUDC debt | 18 | 14 | 13
Interest Expense | CERC Corp |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized interest and AFUDC debt | 6 | 7 | 3
Other Income (Expense) |  |  |
Significant Accounting Policies [Line Items] |  |  |
AFUDC equity | 62 | 37 | 28
Other Income (Expense) | Houston Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
AFUDC equity | 32 | 24 | 20
Other Income (Expense) | CERC Corp |  |  |
Significant Accounting Policies [Line Items] |  |  |
AFUDC equity | $ 14 | $ 5 | $ 5

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