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Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Carrying Amount    
Liabilities    
Carrying amount or fair value $ 13,870 $ 16,086
Fair Value    
Liabilities    
Carrying amount or fair value 14,056 17,385
Fair Value, Recurring    
Assets    
Equity securities 720 1,439
Investments, including money market funds (1) 39 42
Total assets 798 1,495
Liabilities    
Total liabilities 803 917
Fair Value, Recurring | Natural gas derivatives    
Assets    
Natural gas derivatives 39 14
Fair Value, Recurring | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 797 903
Fair Value, Recurring | Interest rate derivatives    
Liabilities    
Derivative liabilities 6 14
Fair Value, Recurring | Level 1    
Assets    
Equity securities 720 1,439
Investments, including money market funds (1) 39 42
Total assets 759 1,481
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 1 | Natural gas derivatives    
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 (1) 0 0
Total assets 39 14
Liabilities    
Total liabilities 803 917
Fair Value, Recurring | Level 2 | Natural gas derivatives    
Assets    
Natural gas derivatives 39 14
Fair Value, Recurring | Level 2 | Indexed debt securities derivative    
Liabilities    
Derivative liabilities 797 903
Fair Value, Recurring | Level 2 | Interest rate derivatives    
Liabilities    
Derivative liabilities 6 14
Fair Value, Recurring | Level 3    
Assets    
Equity securities 0 0
Investments, including money market funds (1) 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 3 | Natural gas derivatives    
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
Houston Electric | Carrying Amount    
Liabilities    
Carrying amount or fair value 6,243 5,495
Houston Electric | Fair Value    
Liabilities    
Carrying amount or fair value 6,378 6,230
Houston Electric | Fair Value, Recurring    
Assets    
Investments, including money market funds (1) 24 27
Total assets 24 27
Houston Electric | Fair Value, Recurring | Level 1    
Assets    
Investments, including money market funds (1) 24 27
Total assets 24 27
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 3,180 4,380
CERC Corp | Fair Value    
Liabilities    
Carrying amount or fair value 3,277 4,682
CERC Corp | Fair Value, Recurring    
Assets    
Investments, including money market funds (1) 14 14
Total assets 14 14
CERC Corp | Fair Value, Recurring | Level 1    
Assets    
Investments, including money market funds (1) 14 14
Total assets 14 14
CERC Corp | Fair Value, Recurring | Level 2    
Assets    
Investments, including money market funds (1) 0 0
Total assets 0 0
CERC Corp | Fair Value, Recurring | Level 3    
Assets    
Investments, including money market funds (1) 0 0
Total assets $ 0 $ 0