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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Carrying amount    
Liabilities    
Carrying amount or fair value $ 15,066 $ 16,086
Fair value    
Liabilities    
Carrying amount or fair value 13,482 17,385
Houston Electric | Carrying amount    
Liabilities    
Carrying amount or fair value 6,628 5,495
Houston Electric | Fair value    
Liabilities    
Carrying amount or fair value 5,649 6,230
CERC | Carrying amount    
Liabilities    
Carrying amount or fair value 4,571 5,552
CERC | Fair value    
Liabilities    
Carrying amount or fair value 4,324 5,999
Fair Value, Recurring    
Assets    
Equity securities 452 1,439
Investments, including money market funds 32 42
Total assets 519 1,495
Liabilities    
Total liabilities 522 917
Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 17 27
Total assets 17 27
Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 13 14
Total assets 40 26
Fair Value, Recurring | Interest rate derivatives    
Assets    
Derivative assets 1 0
Liabilities    
Derivative liabilities 0 14
Fair Value, Recurring | Natural gas derivatives    
Assets    
Derivative assets 34 14
Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Derivative assets 27 12
Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 522 903
Fair Value, Recurring | Level 1    
Assets    
Equity securities 452 1,439
Investments, including money market funds 32 42
Total assets 484 1,481
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 1 | Houston Electric    
Assets    
Investments, including money market funds 17 27
Total assets 17 27
Fair Value, Recurring | Level 1 | CERC    
Assets    
Investments, including money market funds 13 14
Total assets 13 14
Fair Value, Recurring | Level 1 | Interest rate derivatives    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Level 1 | Natural gas derivatives    
Assets    
Derivative assets 0 0
Fair Value, Recurring | Level 1 | Natural gas derivatives | CERC    
Assets    
Derivative assets 0 0
Fair Value, Recurring | Level 1 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Level 2    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 35 14
Liabilities    
Total liabilities 522 917
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 27 12
Fair Value, Recurring | Level 2 | Interest rate derivatives    
Assets    
Derivative assets 1 0
Liabilities    
Derivative liabilities 0 14
Fair Value, Recurring | Level 2 | Natural gas derivatives    
Assets    
Derivative assets 34 14
Fair Value, Recurring | Level 2 | Natural gas derivatives | CERC    
Assets    
Derivative assets 27 12
Fair Value, Recurring | Level 2 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 522 903
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 | Interest rate derivatives    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Level 3 | Natural gas derivatives    
Assets    
Derivative assets 0 0
Fair Value, Recurring | Level 3 | Natural gas derivatives | CERC    
Assets    
Derivative assets 0 0
Fair Value, Recurring | Level 3 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities $ 0 $ 0