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Fair Value Measurements - Schedule of Assets and Liabilities Measured On Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Assets    
Equity securities $ 640 $ 561
Investments, including money market funds 21 22
Interest rate derivatives 1 0
Total assets 672 584
Liabilities    
Total liabilities 698 622
Houston Electric    
Assets    
Investments, including money market funds 4 5
Interest rate derivatives 1 0
Total assets 5 5
CERC    
Assets    
Investments, including money market funds 16 15
Total assets 25 16
Liabilities    
Total liabilities 0 2
Indexed debt securities derivative    
Liabilities    
Derivative liability 698 619
Natural gas derivatives    
Assets    
Natural gas derivatives 10 1
Liabilities    
Derivative liability 0 3
Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 9 1
Liabilities    
Derivative liability 0 2
Level 1    
Assets    
Equity securities 640 561
Investments, including money market funds 21 22
Interest rate derivatives 0 0
Total assets 661 583
Liabilities    
Total liabilities 0 0
Level 1 | Houston Electric    
Assets    
Investments, including money market funds 4 5
Interest rate derivatives 0 0
Total assets 4 5
Level 1 | CERC    
Assets    
Investments, including money market funds 16 15
Total assets 16 15
Liabilities    
Total liabilities 0 0
Level 1 | Indexed debt securities derivative    
Liabilities    
Derivative liability 0 0
Level 1 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Level 1 | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Level 2    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Interest rate derivatives 1 0
Total assets 11 1
Liabilities    
Total liabilities 698 622
Level 2 | Houston Electric    
Assets    
Investments, including money market funds 0 0
Interest rate derivatives 1 0
Total assets 1 0
Level 2 | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 9 1
Liabilities    
Total liabilities 0 2
Level 2 | Indexed debt securities derivative    
Liabilities    
Derivative liability 698 619
Level 2 | Natural gas derivatives    
Assets    
Natural gas derivatives 10 1
Liabilities    
Derivative liability 0 3
Level 2 | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 9 1
Liabilities    
Derivative liability 0 2
Level 3    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Interest rate derivatives 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Level 3 | Houston Electric    
Assets    
Investments, including money market funds 0 0
Interest rate derivatives 0 0
Total assets 0 0
Level 3 | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Level 3 | Indexed debt securities derivative    
Liabilities    
Derivative liability 0 0
Level 3 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Level 3 | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability $ 0 $ 0