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Fair Value Measurements - Schedule of Assets and Liabilities Measured On Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets    
Natural gas derivatives $ 1 $ 0
Liabilities    
Derivative liability 598 617
CERC    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative liability 6 11
Fair Value, Recurring    
Assets    
Equity securities 531 541
Investments, including money market funds 35 31
Total assets 567 572
Liabilities    
Total liabilities 598 617
Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 20 14
Total assets 20 14
Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 15 15
Total assets 16 15
Liabilities    
Total liabilities 6 11
Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liability 591 605
Fair Value, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative liability 7 12
Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative liability 6 11
Level 1 | Fair Value, Recurring    
Assets    
Equity securities 531 541
Investments, including money market funds 35 31
Total assets 566 572
Liabilities    
Total liabilities 0 0
Level 1 | Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 20 14
Total assets 20 14
Level 1 | Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 15 15
Total assets 15 15
Liabilities    
Total liabilities 0 0
Level 1 | Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liability 0 0
Level 1 | Fair Value, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Level 1 | Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Level 2 | Fair Value, Recurring    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 1 0
Liabilities    
Total liabilities 598 617
Level 2 | Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Level 2 | Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 1 0
Liabilities    
Total liabilities 6 11
Level 2 | Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liability 591 605
Level 2 | Fair Value, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative liability 7 12
Level 2 | Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 1 0
Liabilities    
Derivative liability 6 11
Level 3 | Fair Value, Recurring    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Level 3 | Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Level 3 | Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Level 3 | Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liability 0 0
Level 3 | Fair Value, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Level 3 | Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability $ 0 $ 0