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Summary of Significant Accounting Policies - Schedule of Interest Capitalized or Deferred (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Significant Accounting Policies [Line Items] |  |  |
Deferred debt interest | $ 65 | $ 65 | $ 51
Houston Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
Deferred debt interest | 24 | 16 | 12
CERC |  |  |
Significant Accounting Policies [Line Items] |  |  |
Deferred debt interest | 36 | 43 | 36
Capitalized Interest and AFUDC Debt |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized interest and AFUDC debt | 33 | 32 | 26
Capitalized Interest and AFUDC Debt | Houston Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized interest and AFUDC debt | 18 | 18 | 14
Capitalized Interest and AFUDC Debt | CERC |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized interest and AFUDC debt | 8 | 6 | 7
AFUDC Equity |  |  |
Significant Accounting Policies [Line Items] |  |  |
AFUDC equity | 66 | 62 | 37
AFUDC Equity | Houston Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
AFUDC equity | 33 | 32 | 24
AFUDC Equity | CERC |  |  |
Significant Accounting Policies [Line Items] |  |  |
AFUDC equity | $ 17 | $ 14 | $ 5

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