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Summary of Significant Accounting Policies - Schedule of Interest Capitalized or Deferred (Details) - USD ($)
$ in Millions
 12 Months Ended
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