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Fair Value Measurements (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure $ 762   $ 732
Assets      
Derivative assets 30   57
Assets, Fair Value Disclosure 788   747
Total derivative assets, netting adjustment [1] (54)   (82)
Liabilities      
Total derivative liabilities, netting adjustment [1] (56)   (101)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 30 $ (622)  
Total gains (losses) (1) (4)  
Total settlements (15) (34)  
Transfers into Level 3 1 0  
Transfers out of Level 3 (2) (2)  
Ending balance (1) [2] 13 (662)  
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date: (2) (5)  
Carrying Amount [Member]      
Estimated Fair Value of Financial Instruments      
Long-term debt, including current maturities [3] 14,138   9,140
Fair Value [Member]      
Estimated Fair Value of Financial Instruments      
Long-term debt, including current maturities [3] 14,693   9,308
Energy Related Derivative [Member]      
Assets      
Derivative fair value offsets, net 2   19
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 6   24
Assets      
Assets, Fair Value Disclosure 692   609
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 799   792
Assets      
Assets, Fair Value Disclosure 124   173
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 13   17
Assets      
Assets, Fair Value Disclosure $ 26   47
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) 0.03    
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) 6.23    
Fair Value, Measurements, Recurring [Member]      
Assets      
Corporate equities $ 625   542
Investments, including money market funds (2) [4] 66   66
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liabilities 3   24
Fair Value, Measurements, Recurring [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset, netting adjustment [1],[5] 54   (82)
Derivative assets [5] 96   138
Liabilities      
Derivative liabilities, netting adjustment [1],[5] (56)   (101)
Derivative liabilities [5] 66   107
Fair Value, Measurements, Recurring [Member] | IDS Derivative [Member]      
Liabilities      
Derivative liabilities, netting adjustment [1] 0   0
Derivative liabilities 687   601
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets      
Corporate equities 625   542
Investments, including money market funds (2) [4] 66   66
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liability 0   24
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset [5] 0   0
Liabilities      
Derivative liability [5] 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | IDS Derivative [Member]      
Liabilities      
Derivative liability 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets      
Corporate equities 0   0
Investments, including money market funds (2) [4] 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liability 3   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset [5] 124   173
Liabilities      
Derivative liability [5] 109   191
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | IDS Derivative [Member]      
Liabilities      
Derivative liability 687   601
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets      
Corporate equities 0   0
Investments, including money market funds (2) [4] 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liability 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset [5] 26   47
Liabilities      
Derivative liability [5] 13   17
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | IDS Derivative [Member]      
Liabilities      
Derivative liability 0   0
CERC Corp [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 62   107
Assets      
Derivative assets 30   57
Assets, Fair Value Disclosure 110   152
Total derivative assets, netting adjustment [1] (54)   (82)
Liabilities      
Total derivative liabilities, netting adjustment [1] (56)   (101)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 30 46  
Total gains (losses) (1) 2  
Total settlements 15 (34)  
Transfers into Level 3 1 0  
Transfers out of Level 3 2 (2)  
Ending balance (1) [2] 13 12  
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date: (2) $ (4)  
CERC Corp [Member] | Carrying Amount [Member]      
Estimated Fair Value of Financial Instruments      
Long-term debt, including current maturities 2,384   2,371
CERC Corp [Member] | Fair Value [Member]      
Estimated Fair Value of Financial Instruments      
Long-term debt, including current maturities 2,560   2,488
CERC Corp [Member] | Energy Related Derivative [Member]      
Assets      
Derivative fair value offsets, net 2   19
CERC Corp [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 6   0
Assets      
Assets, Fair Value Disclosure 14   14
CERC Corp [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 99   191
Assets      
Assets, Fair Value Disclosure 124   173
CERC Corp [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 13   17
Assets      
Assets, Fair Value Disclosure $ 26   47
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) 0.03    
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) 6.23    
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member]      
Assets      
Corporate equities $ 2   2
Investments, including money market funds (2) [4] 11   11
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset, netting adjustment [1],[5],[6] (54)   (82)
Derivative assets [5],[6] 96   138
Liabilities      
Derivative liabilities, netting adjustment [1],[5],[6] (56)   (101)
Derivative liabilities [5],[6] 56   107
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets      
Corporate equities 2   2
Investments, including money market funds (2) [4] 11   11
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset [5],[6] 0   0
Liabilities      
Derivative liability [5],[6] 0   0
CERC Corp [Member] | Fair Value, Measurements, 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, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset [5],[6] 124   173
Liabilities      
Derivative liability [5],[6] 99   191
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets      
Corporate equities 0   0
Investments, including money market funds (2) [4] 0   0
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]      
Assets      
Derivative asset [5],[6] 26   47
Liabilities      
Derivative liability [5],[6] 13   17
Houston Electric [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 0   24
Assets      
Assets, Fair Value Disclosure 48   48
Total derivative assets, netting adjustment 0   0
Liabilities      
Total derivative liabilities, netting adjustment 0   0
Houston Electric [Member] | Carrying Amount [Member]      
Estimated Fair Value of Financial Instruments      
Long-term debt, including current maturities [3] 5,231   4,717
Houston Electric [Member] | Fair Value [Member]      
Estimated Fair Value of Financial Instruments      
Long-term debt, including current maturities [3] 5,494   4,770
Houston Electric [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 0   24
Assets      
Assets, Fair Value Disclosure 48   48
Houston Electric [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 0   0
Assets      
Assets, Fair Value Disclosure 0   0
Houston Electric [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Financial Liabilities Fair Value Disclosure 0   0
Assets      
Assets, Fair Value Disclosure 0   0
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member]      
Assets      
Investments, including money market funds (2) [4] 48   48
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liabilities 0   24
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets      
Investments, including money market funds (2) [4] 48   48
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liability 0   24
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets      
Investments, including money market funds (2) [4] 0   0
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liability 0   0
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets      
Investments, including money market funds (2) [4] 0   0
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]      
Liabilities      
Derivative liability 0   0
Natural gas inventory [Member] | Fair Value, Measurements, Recurring [Member]      
Assets      
Hedged portion of natural gas inventory 0   1
Liabilities      
Fair Value Hedge Liabilities 6   0
Natural gas inventory [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets      
Hedged portion of natural gas inventory 0   1
Liabilities      
Fair Value Hedge Liabilities 6   0
Natural gas inventory [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets      
Hedged portion of natural gas inventory 0   0
Liabilities      
Fair Value Hedge Liabilities 0   0
Natural gas inventory [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets      
Hedged portion of natural gas inventory 0   0
Liabilities      
Fair Value Hedge Liabilities 0   0
Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member]      
Assets      
Hedged portion of natural gas inventory 0   1
Liabilities      
Fair Value Hedge Liabilities 6   0
Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets      
Hedged portion of natural gas inventory 0   1
Liabilities      
Fair Value Hedge Liabilities 6   0
Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets      
Hedged portion of natural gas inventory 0   0
Liabilities      
Fair Value Hedge Liabilities 0   0
Natural gas inventory [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets      
Hedged portion of natural gas inventory 0   0
Liabilities      
Fair Value Hedge Liabilities 0   0
Borrowed gas [Member] | Fair Value, Measurements, Recurring [Member]      
Assets      
Hedged portion of natural gas inventory [7] 1   0
Borrowed gas [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets      
Hedged portion of natural gas inventory [7] 1   0
Borrowed gas [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets      
Hedged portion of natural gas inventory [7] 0   0
Borrowed gas [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets      
Hedged portion of natural gas inventory [7] 0   0
Borrowed gas [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member]      
Assets      
Hedged portion of natural gas inventory [7] 1   0
Borrowed gas [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets      
Hedged portion of natural gas inventory [7] 1   0
Borrowed gas [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets      
Hedged portion of natural gas inventory [7] 0   0
Borrowed gas [Member] | CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets      
Hedged portion of natural gas inventory [7] $ 0   $ 0
[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 of $2 million and $19 million as of March 31, 2019 and December 31, 2018, respectively, posted with the same counterparties.
[2] CenterPoint Energy and CERC did not have significant Level 3 sales or purchases during either of the three months ended March 31, 2019 or 2018.
[3] Includes Securitization Bonds debt.
[4] Amounts are included in Prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets.
[5] Natural gas derivatives include no material amounts related to physical forward transactions with Enable.
[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] Amounts are included in Other current liabilities in the Condensed Consolidated Balance Sheets.