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Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Carrying amount    
Liabilities    
Carrying amount or fair value $ 15,996 $ 16,338
Fair value    
Liabilities    
Carrying amount or fair value 14,965 14,990
Houston Electric | Carrying amount    
Liabilities    
Carrying amount or fair value 7,245 6,353
Houston Electric | Fair value    
Liabilities    
Carrying amount or fair value 6,556 5,504
CERC | Carrying amount    
Liabilities    
Carrying amount or fair value 3,937 4,826
CERC | Fair value    
Liabilities    
Carrying amount or fair value 3,840 4,637
Fair Value, Recurring    
Assets    
Equity securities 548 510
Investments, including money market funds 30 32
Total assets 579 554
Liabilities    
Total liabilities 617 578
Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 15 17
Total assets 15 17
Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 13 14
Total assets 14 23
Fair Value, Recurring | Interest rate derivatives    
Assets    
Derivative assets 0 1
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Natural gas derivatives    
Assets    
Derivative assets 1 11
Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Derivative assets 1 9
Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 617 578
Fair Value, Recurring | Level 1    
Assets    
Equity securities 548 510
Investments, including money market funds 30 32
Total assets 578 542
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 1 | Houston Electric    
Assets    
Investments, including money market funds 15 17
Total assets 15 17
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 1 12
Liabilities    
Total liabilities 617 578
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 1 9
Fair Value, Recurring | Level 2 | Interest rate derivatives    
Assets    
Derivative assets 0 1
Liabilities    
Derivative liabilities 0 0
Fair Value, Recurring | Level 2 | Natural gas derivatives    
Assets    
Derivative assets 1 11
Fair Value, Recurring | Level 2 | Natural gas derivatives | CERC    
Assets    
Derivative assets 1 9
Fair Value, Recurring | Level 2 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 617 578
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