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Fair Value Measurements (Details)
$ in Millions
 3 Months Ended
Apr. 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Assets        
Derivative assets   $ 45   $ 47
Assets, Fair Value Disclosure   942   1,068
Total derivative assets, netting adjustment [1]   (133)   (98)
Liabilities        
Financial Liabilities Fair Value Disclosure   864   996
Total derivative liabilities, netting adjustment [1]   (183)   (161)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 23 [2] 18 $ 30  
Total gains (losses)   15 (1)  
Total settlements   (10) (15)  
Transfers into Level 3   0 1  
Transfers out of Level 3   0 (2)  
Ending balance (1) [2]   23 13  
The amount of total gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date:   14 (2)  
Goodwill, Impairment Loss   185 0  
Carrying Amount [Member]        
Estimated Fair Value of Financial Instruments        
Long-term debt, including current maturities [3]   15,238   15,093
Fair Value [Member]        
Estimated Fair Value of Financial Instruments        
Long-term debt, including current maturities [3]   16,047   16,067
Energy Related Derivative [Member]        
Liabilities        
Derivative fair value offsets, net   50   63
Fair Value, Inputs, Level 1 [Member]        
Assets        
Assets, Fair Value Disclosure   729   874
Liabilities        
Financial Liabilities Fair Value Disclosure   21   13
Fair Value, Inputs, Level 2 [Member]        
Assets        
Assets, Fair Value Disclosure   305   250
Liabilities        
Financial Liabilities Fair Value Disclosure   1,008   1,120
Fair Value, Inputs, Level 3 [Member]        
Assets        
Assets, Fair Value Disclosure   41   42
Liabilities        
Financial Liabilities Fair Value Disclosure   $ 18   24
Fair Value, Inputs, Level 3 [Member] | Forward Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Volumetrically Weighted Average, Price Per MMBtu   2.22    
Fair Value, Inputs, Level 3 [Member] | Forward Contracts [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Fair value inputs (price per MMBtu)   1.15    
Fair Value, Inputs, Level 3 [Member] | Forward Contracts [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Fair value inputs (price per MMBtu)   4.83    
Fair Value, Recurring [Member]        
Assets        
Corporate equities   $ 680   825
Investments, including money market funds (2) [4]   48   49
Fair Value, Recurring [Member] | Interest Rate Contract [Member]        
Liabilities        
Derivative liabilities   26   10
Fair Value, Recurring [Member] | Energy Related Derivative [Member]        
Liabilities        
Derivative liabilities, netting adjustment   0   0
Derivative liabilities   23   22
Fair Value, Recurring [Member] | IDS Derivative [Member]        
Liabilities        
Derivative liabilities, netting adjustment [1]   0   0
Derivative liabilities   758   893
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Corporate equities   680   825
Investments, including money market funds (2) [4]   48   49
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]        
Liabilities        
Derivative liability   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Related Derivative [Member]        
Liabilities        
Derivative liability   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | IDS Derivative [Member]        
Liabilities        
Derivative liability   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets        
Corporate equities   0   0
Investments, including money market funds (2) [4]   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]        
Liabilities        
Derivative liability   26   10
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]        
Liabilities        
Derivative liability   23   22
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | IDS Derivative [Member]        
Liabilities        
Derivative liability   758   893
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets        
Corporate equities   0   0
Investments, including money market funds (2) [4]   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]        
Liabilities        
Derivative liability   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]        
Liabilities        
Derivative liability   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | IDS Derivative [Member]        
Liabilities        
Derivative liability   0   0
Houston Electric [Member]        
Assets        
Assets, Fair Value Disclosure   31   32
Total derivative assets, netting adjustment   0   0
Houston Electric [Member] | Carrying Amount [Member]        
Estimated Fair Value of Financial Instruments        
Long-term debt, including current maturities [3]   4,888   4,950
Houston Electric [Member] | Fair Value [Member]        
Estimated Fair Value of Financial Instruments        
Long-term debt, including current maturities [3]   5,368   5,457
Houston Electric [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Assets, Fair Value Disclosure   31   32
Houston Electric [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets        
Assets, Fair Value Disclosure   0   0
Houston Electric [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets        
Assets, Fair Value Disclosure   0   0
Houston Electric [Member] | Fair Value, Recurring [Member]        
Assets        
Investments, including money market funds (2) [4]   31   32
Houston Electric [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Investments, including money market funds (2) [4]   31   32
Houston Electric [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets        
Investments, including money market funds (2) [4]   0   0
Houston Electric [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets        
Investments, including money market funds (2) [4]   0   0
CERC Corp [Member]        
Assets        
Derivative assets   45   47
Assets, Fair Value Disclosure   226   207
Total derivative assets, netting adjustment [1]   (133)   (98)
Liabilities        
Financial Liabilities Fair Value Disclosure   57   71
Total derivative liabilities, netting adjustment [1]   (183)   (161)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 23 [2] 18 30  
Total gains (losses)   15 (1)  
Total settlements   (10) (15)  
Transfers into Level 3   0 1  
Transfers out of Level 3   0 (2)  
Ending balance (1) [2]   23 13  
The amount of total gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date:   14 (2)  
CERC Corp [Member] | Carrying Amount [Member]        
Estimated Fair Value of Financial Instruments        
Long-term debt, including current maturities   2,377   2,546
CERC Corp [Member] | Fair Value [Member]        
Estimated Fair Value of Financial Instruments        
Long-term debt, including current maturities   2,637   2,803
CERC Corp [Member] | Energy Related Derivative [Member]        
Liabilities        
Derivative fair value offsets, net   50   63
CERC Corp [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Assets, Fair Value Disclosure   13   13
Liabilities        
Financial Liabilities Fair Value Disclosure   21   13
CERC Corp [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets        
Assets, Fair Value Disclosure   305   250
Liabilities        
Financial Liabilities Fair Value Disclosure   201   195
CERC Corp [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets        
Assets, Fair Value Disclosure   41   42
Liabilities        
Financial Liabilities Fair Value Disclosure   $ 18   24
CERC Corp [Member] | Fair Value, Inputs, Level 3 [Member] | Forward Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Volumetrically Weighted Average, Price Per MMBtu   2.22    
CERC Corp [Member] | Fair Value, Inputs, Level 3 [Member] | Forward Contracts [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Fair value inputs (price per MMBtu)   1.15    
CERC Corp [Member] | Fair Value, Inputs, Level 3 [Member] | Forward Contracts [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Fair value inputs (price per MMBtu)   4.83    
CERC Corp [Member] | Fair Value, Recurring [Member]        
Assets        
Corporate equities   $ 1   2
Investments, including money market funds (2) [4]   11   11
CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Corporate equities   1   2
Investments, including money market funds (2) [4]   11   11
CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets        
Corporate equities   0   0
Investments, including money market funds (2) [4]   0   0
CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets        
Corporate equities   0   0
Investments, including money market funds (2) [4]   0   0
Infrastructure Services [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Goodwill, Impairment Loss   82    
Fair Value Of Disposal Group   864    
Energy Services [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Goodwill, Impairment Loss   62    
Loss on assets held for sale   70    
Fair Value Of Disposal Group   402    
Energy Services [Member] | Fair Value, Recurring [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset, netting adjustment [1],[5],[6],[7]   (133)   (98)
Derivative assets [5],[6],[7]   213   194
Liabilities        
Derivative liabilities, netting adjustment [1],[5],[6],[7]   (183)   (161)
Derivative liabilities [5],[6],[7]   36   58
Energy Services [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset [5],[6],[7]   0   0
Liabilities        
Derivative liability [5],[6],[7]   0   0
Energy Services [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset [5],[6],[7]   305   250
Liabilities        
Derivative liability [5],[6],[7]   201   195
Energy Services [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset [5],[6],[7]   41   42
Liabilities        
Derivative liability [5],[6],[7]   18   24
Energy Services [Member] | CERC Corp [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Goodwill, Impairment Loss   62    
Loss on assets held for sale   70    
Energy Services [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset, netting adjustment [1],[5],[6],[7]   (133)   (98)
Derivative assets [5],[6],[7]   213   194
Liabilities        
Derivative liabilities, netting adjustment [1],[5],[6],[7]   (183)   (161)
Derivative liabilities [5],[6],[7]   36   58
Energy Services [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset [5],[6],[7]   0   0
Liabilities        
Derivative liability [5],[6],[7]   0   0
Energy Services [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset [5],[6],[7]   305   250
Liabilities        
Derivative liability [5],[6],[7]   201   195
Energy Services [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]        
Assets        
Derivative asset [5],[6],[7]   41   42
Liabilities        
Derivative liability [5],[6],[7]   18   24
Energy Services [Member] | Natural gas inventory [Member] | Fair Value, Recurring [Member]        
Liabilities        
Fair Value Hedge Liabilities   19   13 [5]
Energy Services [Member] | Natural gas inventory [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Liabilities        
Fair Value Hedge Liabilities   19   13 [5]
Energy Services [Member] | Natural gas inventory [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   0
Energy Services [Member] | Natural gas inventory [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   0
Energy Services [Member] | Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Recurring [Member]        
Liabilities        
Fair Value Hedge Liabilities [5]   19   13
Energy Services [Member] | Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Liabilities        
Fair Value Hedge Liabilities [5]   19   13
Energy Services [Member] | Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   0
Energy Services [Member] | Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   0
Energy Services [Member] | Gas Imbalance Payable [Member] | Fair Value, Recurring [Member]        
Assets        
Hedged portion of natural gas inventory (5)   1   0
Energy Services [Member] | Gas Imbalance Payable [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Hedged portion of natural gas inventory (5)   1   0
Energy Services [Member] | Gas Imbalance Payable [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets        
Hedged portion of natural gas inventory (5)   0   0
Energy Services [Member] | Gas Imbalance Payable [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets        
Hedged portion of natural gas inventory (5)   0   0
Energy Services [Member] | Gas Imbalance Payable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member]        
Assets        
Hedged portion of natural gas inventory (5)   1   0
Energy Services [Member] | Gas Imbalance Payable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets        
Hedged portion of natural gas inventory (5)   1   0
Energy Services [Member] | Gas Imbalance Payable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Assets        
Hedged portion of natural gas inventory (5)   0   0
Energy Services [Member] | Gas Imbalance Payable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets        
Hedged portion of natural gas inventory (5)   0   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | Fair Value, Recurring [Member]        
Liabilities        
Fair Value Hedge Liabilities   2   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Liabilities        
Fair Value Hedge Liabilities   2   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member]        
Liabilities        
Fair Value Hedge Liabilities   2   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Liabilities        
Fair Value Hedge Liabilities   2   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   0
Energy Services [Member] | Gas Imbalance Receivable [Member] | CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Liabilities        
Fair Value Hedge Liabilities   0   $ 0
Enable Midstream Partners [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Equity Method Investment, Other than Temporary Impairment   1,541 $ 0  
Equity Method Investments, Fair Value Disclosure   848    
Indiana Electric Integrated [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Goodwill, Impairment Loss   $ 185    
Subsequent Event [Member] | Common Units [Member] | Enable Midstream Partners [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Percentage Reduction of Dividend or Distribution Amount 50.00%      
[1]
Amounts represent the impact of legally enforceable master netting arrangements that allow CenterPoint Energy and CERC to settle positive and negative positions and also include cash collateral posted with the same counterparties as follows:
 
March 31, 2020
 
December 31, 2019
 
CenterPoint Energy
 
CERC
 
CenterPoint Energy
 
CERC
 
(in millions)
Cash collateral posted with the same counterparties
$
50

 
$
50

 
$
63

 
$
63
[2]
CenterPoint Energy and CERC did not have significant Level 3 purchases or sales during the three months ended March 31, 2020 or 2019. The Level 3 assets and liabilities as of March 31, 2020 and 2019 are classified in the CenterPoint Energy’s and CERC’s respective Condensed Consolidated Balance Sheets as held for sale.
[3]
Includes Securitization Bonds debt.
[4]
Amounts are included in Prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets.
[5]
Amounts are classified as held for sale in the Registrants’ respective Condensed Consolidated Balance Sheets.
[6]
Level 1 natural gas derivatives include exchange-traded derivatives cleared by the CME, which deems that financial instruments cleared by the CME are settled daily in connection with posted cash payments. As a result of this exchange rule, CME-related derivatives are considered to have no fair value at the balance sheet date for financial reporting purposes and are presented in Level 1 net of posted cash; however, the derivatives remain outstanding and subject to future commodity price fluctuations until they are settled in accordance with their contractual terms. Derivative transactions cleared on exchanges other than the CME (e.g., the Intercontinental Exchange or ICE) continue to be reported on a gross basis.
[7] Natural gas derivatives include no material amounts related to physical forward transactions with Enable.