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Fair Value Measurements - Schedule of Assets and Liabilities Measured On Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Measurements, Recurring    
Assets    
Equity securities $ 541 $ 510
Investments, including money market funds 31 32
Interest rate derivatives 0 1
Total assets 572 554
Liabilities    
Total liabilities 617 578
Fair Value, Measurements, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative Liability 605 578
Fair Value, Measurements, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 0 11
Liabilities    
Derivative Liability 12 0
Fair Value, Measurements, Recurring | Level 1    
Assets    
Equity securities 541 510
Investments, including money market funds 31 32
Interest rate derivatives 0 0
Total assets 572 542
Liabilities    
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Indexed debt securities derivative    
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 1 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Interest rate derivatives 0 1
Total assets 0 12
Liabilities    
Total liabilities 617 578
Fair Value, Measurements, Recurring | Level 2 | Indexed debt securities derivative    
Liabilities    
Derivative Liability 605 578
Fair Value, Measurements, Recurring | Level 2 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 11
Liabilities    
Derivative Liability 12 0
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | Level 3 | Indexed debt securities derivative    
Liabilities    
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Level 3 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability 0 0
Houston Electric | Fair Value, Measurements, Recurring    
Assets    
Investments, including money market funds 14 17
Total assets 14 17
Houston Electric | Fair Value, Measurements, Recurring | Level 1    
Assets    
Investments, including money market funds 14 17
Total assets 14 17
Houston Electric | Fair Value, Measurements, Recurring | Level 2    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Houston Electric | Fair Value, Measurements, Recurring | Level 3    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
CERC Corp    
Liabilities    
Total liabilities 11 0
CERC Corp | Level 1    
Liabilities    
Total liabilities 0 0
CERC Corp | Level 2    
Liabilities    
Total liabilities 11 0
CERC Corp | Level 3    
Liabilities    
Total liabilities 0 0
CERC Corp | Fair Value, Measurements, Recurring    
Assets    
Investments, including money market funds 15 14
Total assets 15 23
CERC Corp | Fair Value, Measurements, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 0 9
Liabilities    
Derivative Liability 11 0
CERC Corp | Fair Value, Measurements, Recurring | Level 1    
Assets    
Investments, including money market funds 15 14
Total assets 15 14
CERC Corp | Fair Value, Measurements, Recurring | Level 1 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability 0 0
CERC Corp | Fair Value, Measurements, Recurring | Level 2    
Assets    
Investments, including money market funds 0 0
Total assets 0 9
CERC Corp | Fair Value, Measurements, Recurring | Level 2 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 9
Liabilities    
Derivative Liability 11 0
CERC Corp | Fair Value, Measurements, Recurring | Level 3    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
CERC Corp | Fair Value, Measurements, Recurring | Level 3 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative Liability $ 0 $ 0