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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Carrying Amount    
Liabilities    
Carrying amount or fair value $ 16,131 $ 13,401
Fair Value    
Liabilities    
Carrying amount or fair value 17,611 15,226
Fair Value, Recurring    
Assets    
Corporate equities 926 873
Investments, including money market funds (1) 42 43
Total assets 975 916
Liabilities    
Total liabilities 1,018 983
Fair Value, Recurring | IDS Derivative    
Liabilities    
Derivative liabilities 1,004 953
Fair Value, Recurring | Interest rate derivatives    
Liabilities    
Derivative liabilities 14 20
Fair Value, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 7 0
Liabilities    
Derivative liabilities 0 10
Fair Value, Recurring | Level 1    
Assets    
Corporate equities 926 873
Investments, including money market funds (1) 42 43
Total assets 968 916
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 1 | IDS Derivative    
Liabilities    
Derivative liability 0 0
Fair Value, Recurring | Level 1 | Interest rate derivatives    
Liabilities    
Derivative liability 0 0
Fair Value, Recurring | Level 1 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Fair Value, Recurring | Level 2    
Assets    
Corporate equities 0 0
Investments, including money market funds (1) 0 0
Total assets 7 0
Liabilities    
Total liabilities 1,018 983
Fair Value, Recurring | Level 2 | IDS Derivative    
Liabilities    
Derivative liability 1,004 953
Fair Value, Recurring | Level 2 | Interest rate derivatives    
Liabilities    
Derivative liability 14 20
Fair Value, Recurring | Level 2 | Natural gas derivatives    
Assets    
Natural gas derivatives 7 0
Liabilities    
Derivative liability 0 10
Fair Value, Recurring | Level 3    
Assets    
Corporate equities 0 0
Investments, including money market funds (1) 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 3 | IDS Derivative    
Liabilities    
Derivative liability 0 0
Fair Value, Recurring | Level 3 | Interest rate derivatives    
Liabilities    
Derivative liability 0 0
Fair Value, Recurring | Level 3 | Natural gas derivatives    
Assets    
Natural gas derivatives 0 0
Liabilities    
Derivative liability 0 0
Houston Electric | Carrying Amount    
Liabilities    
Carrying amount or fair value 5,595 5,019
Houston Electric | Fair Value    
Liabilities    
Carrying amount or fair value 6,403 5,957
Houston Electric | Fair Value, Recurring    
Assets    
Investments, including money market funds (1) 26 26
Total assets 26 26
Houston Electric | Fair Value, Recurring | Level 1    
Assets    
Investments, including money market funds (1) 26 26
Total assets 26 26
Houston Electric | Fair Value, Recurring | Level 2    
Assets    
Investments, including money market funds (1) 0 0
Total assets 0 0
Houston Electric | Fair Value, Recurring | Level 3    
Assets    
Investments, including money market funds (1) 0 0
Total assets 0 0
CERC Corp | Carrying Amount    
Liabilities    
Carrying amount or fair value 4,343 2,428
CERC Corp | Fair Value    
Liabilities    
Carrying amount or fair value 4,680 2,855
CERC Corp | Fair Value, Recurring    
Assets    
Corporate equities 3 2
Investments, including money market funds (1) 11 11
Total assets 14 13
CERC Corp | Fair Value, Recurring | Level 1    
Assets    
Corporate equities 3 2
Investments, including money market funds (1) 11 11
Total assets 14 13
CERC Corp | Fair Value, Recurring | Level 2    
Assets    
Corporate equities 0 0
Investments, including money market funds (1) 0 0
Total assets 0 0
CERC Corp | Fair Value, Recurring | Level 3    
Assets    
Corporate equities 0 0
Investments, including money market funds (1) 0 0
Total assets $ 0 $ 0