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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Carrying amount    
Liabilities    
Carrying amount or fair value $ 18,263 $ 16,338
Carrying amount | Houston Electric    
Liabilities    
Carrying amount or fair value 7,665 6,353
Carrying amount | CERC    
Liabilities    
Carrying amount or fair value 4,243 4,826
Fair value    
Liabilities    
Carrying amount or fair value 16,283 14,990
Fair value | Houston Electric    
Liabilities    
Carrying amount or fair value 6,397 5,504
Fair value | CERC    
Liabilities    
Carrying amount or fair value 3,908 4,637
Fair Value, Recurring    
Assets    
Equity securities 566 510
Investments, including money market funds 31 32
Total assets 598 554
Liabilities    
Total liabilities 630 578
Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 14 17
Total assets 14 17
Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 14 14
Total assets 15 23
Fair Value, Recurring | Interest rate derivatives    
Assets    
Derivative assets 0 1
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    
Indexed debt securities derivative 630 578
Level 1 | Fair Value, Recurring    
Assets    
Equity securities 566 510
Investments, including money market funds 31 32
Total assets 597 542
Liabilities    
Total liabilities 0 0
Level 1 | Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 14 17
Total assets 14 17
Level 1 | Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 14 14
Total assets 14 14
Level 1 | Fair Value, Recurring | Interest rate derivatives    
Assets    
Derivative assets 0 0
Level 1 | Fair Value, Recurring | Natural gas derivatives    
Assets    
Derivative assets 0 0
Level 1 | Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Derivative assets 0 0
Level 1 | Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Indexed debt securities derivative 0 0
Level 2 | Fair Value, Recurring    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 1 12
Liabilities    
Total liabilities 630 578
Level 2 | Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Level 2 | Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 1 9
Level 2 | Fair Value, Recurring | Interest rate derivatives    
Assets    
Derivative assets 0 1
Level 2 | Fair Value, Recurring | Natural gas derivatives    
Assets    
Derivative assets 1 11
Level 2 | Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Derivative assets 1 9
Level 2 | Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Indexed debt securities derivative 630 578
Level 3 | Fair Value, Recurring    
Assets    
Equity securities 0 0
Investments, including money market funds 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Level 3 | Fair Value, Recurring | Houston Electric    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Level 3 | Fair Value, Recurring | CERC    
Assets    
Investments, including money market funds 0 0
Total assets 0 0
Level 3 | Fair Value, Recurring | Interest rate derivatives    
Assets    
Derivative assets 0 0
Level 3 | Fair Value, Recurring | Natural gas derivatives    
Assets    
Derivative assets 0 0
Level 3 | Fair Value, Recurring | Natural gas derivatives | CERC    
Assets    
Derivative assets 0 0
Level 3 | Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Indexed debt securities derivative $ 0 $ 0