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Fair Value Measurements - Schedule of Assets and Liabilities Measured On Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
CERC    
Liabilities    
Total liabilities $ 2 $ 11
Level 1 | CERC    
Liabilities    
Total liabilities 0 0
Level 2 | CERC    
Liabilities    
Total liabilities 2 11
Level 3 | CERC    
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring    
Assets    
Equity securities 561 541
Investments, including money market funds 22 31
Total assets 584 572
Liabilities    
Total liabilities 622 617
Fair Value, Measurements, Recurring | Houston Electric    
Assets    
Investments, including money market funds 5 14
Total assets 5 14
Fair Value, Measurements, Recurring | CERC    
Assets    
Investments, including money market funds 15 15
Total assets 16 15
Fair Value, Measurements, Recurring | Natural gas derivatives (2)    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative Liability 3 12
Fair Value, Measurements, Recurring | Natural gas derivatives (2) | CERC    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative Liability 2 11
Fair Value, Measurements, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative Liability 619 605
Fair Value, Measurements, Recurring | Level 1    
Assets    
Equity securities 561 541
Investments, including money market funds 22 31
Total assets 583 572
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Houston Electric    
Assets    
Investments, including money market funds 5 14
Total assets 5 14
Fair Value, Measurements, Recurring | Level 1 | CERC    
Assets    
Investments, including money market funds 15 15
Total assets 15 15
Fair Value, Measurements, Recurring | Level 1 | Natural gas derivatives (2)    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 1 | Natural gas derivatives (2) | CERC    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 1 | Indexed debt securities derivative    
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 1 0
Liabilities    
Total liabilities 622 617
Fair Value, Measurements, Recurring | Level 2 | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Fair Value, Measurements, Recurring | Level 2 | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 1 0
Fair Value, Measurements, Recurring | Level 2 | Natural gas derivatives (2)    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative Liability 3 12
Fair Value, Measurements, Recurring | Level 2 | Natural gas derivatives (2) | CERC    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative Liability 2 11
Fair Value, Measurements, Recurring | Level 2 | Indexed debt securities derivative    
Liabilities    
Derivative Liability 619 605
Fair Value, Measurements, Recurring | Level 3    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Fair Value, Measurements, Recurring | Level 3 | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Natural gas derivatives (2)    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 3 | Natural gas derivatives (2) | CERC    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 3 | Indexed debt securities derivative    
Liabilities    
Derivative Liability $ 0 $ 0