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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Carrying amount    
Liabilities    
Carrying amount or fair value $ 15,001 $ 16,086
Fair value    
Liabilities    
Carrying amount or fair value 14,225 17,385
Houston Electric | Carrying amount    
Liabilities    
Carrying amount or fair value 6,169 5,495
Houston Electric | Fair value    
Liabilities    
Carrying amount or fair value 5,705 6,230
CERC | Carrying amount    
Liabilities    
Carrying amount or fair value 4,571 5,552
CERC | Fair value    
Liabilities    
Carrying amount or fair value 4,496 5,999
Fair Value, Recurring    
Assets    
Equity securities 658 1,439
Investments, including money market funds 38 42
Total assets 728 1,495
Liabilities    
Total liabilities 732 917
Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 23 27
Total assets 23 27
Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 13 14
Total assets 39 26
Fair Value, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 32 14
Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 26 12
Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 732 903
Fair Value, Recurring | Interest rate derivatives    
Liabilities    
Derivative liabilities 0 14
Fair Value, Recurring | Level 1    
Assets    
Equity securities 658 1,439
Investments, including money market funds 38 42
Total assets 696 1,481
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 1 | Houston Electric    
Assets    
Investments, including money market funds 23 27
Total assets 23 27
Fair Value, Recurring | Level 1 | CERC    
Assets    
Investments, including money market funds 13 14
Total assets 13 14
Fair Value, Recurring | Level 1 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Fair Value, Recurring | Level 1 | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 0 0
Fair Value, Recurring | Level 1 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Level 1 | Interest rate derivatives    
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Level 2    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 32 14
Liabilities    
Total liabilities 732 917
Fair Value, Recurring | Level 2 | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Fair Value, Recurring | Level 2 | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 26 12
Fair Value, Recurring | Level 2 | Natural gas derivatives    
Assets    
Natural gas derivatives 32 14
Fair Value, Recurring | Level 2 | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 26 12
Fair Value, Recurring | Level 2 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 732 903
Fair Value, Recurring | Level 2 | Interest rate derivatives    
Liabilities    
Derivative liabilities 0 14
Fair Value, 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, Recurring | Level 3 | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Fair Value, Recurring | Level 3 | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Fair Value, Recurring | Level 3 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Fair Value, Recurring | Level 3 | Natural gas derivatives | CERC    
Assets    
Natural gas derivatives 0 0
Fair Value, Recurring | Level 3 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Level 3 | Interest rate derivatives    
Liabilities    
Derivative liabilities $ 0 $ 0