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Long-term Debt (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
day
Oct. 01, 2020
USD ($)
Jun. 02, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Abstract]          
Size of credit facility $ 4,900 $ 4,900      
Number of days until commercial paper maturity | day   60      
Parent Company [Member]          
Line of Credit Facility [Abstract]          
Size of credit facility 3,300 $ 3,300      
VUHI [Member]          
Line of Credit Facility [Abstract]          
Size of credit facility [1] 400 400      
Credit facility swing line sublimit 10 10      
Letters of credit swing line sublimit 20 20      
Houston Electric [Member]          
Debt Instrument [Line Items]          
General mortgage bonds used as collateral 68 68     $ 68
Line of Credit Facility [Abstract]          
Size of credit facility 300 300      
CERC Corp [Member]          
Line of Credit Facility [Abstract]          
Size of credit facility 900 900      
Revolving Credit Facility [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit 0 0     0
Revolving Credit Facility [Member] | Parent Company [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit [2] 0 0     0
Revolving Credit Facility [Member] | VUHI [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit [3] 0 0     0
Revolving Credit Facility [Member] | Houston Electric [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit 0 0     0
Revolving Credit Facility [Member] | CERC Corp [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit $ 0 $ 0     0
Line of Credit [Member] | Parent Company [Member]          
Line of Credit Facility [Abstract]          
Ratio of indebtedness to net capital [4] 0.534 0.534      
Percentage on limitation of debt to total capitalization under covenant amended (in hundredths)   70.00%      
System restoration costs threshold for increase in permitted debt to EBITDA covenant ratio   $ 100      
Consecutive period for system restoration costs to exceed $100 million (in months)   12      
Percentage on limitation of debt to total capitalization under covenant (in hundredths) [5]   65.00%      
Line of Credit [Member] | Parent Company [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Abstract]          
Basis spread on LIBOR [6]   1.50%      
Line of Credit [Member] | VUHI [Member]          
Line of Credit Facility [Abstract]          
Ratio of indebtedness to net capital [1],[4] 0.525 0.525      
Percentage on limitation of debt to total capitalization under covenant (in hundredths) [1]   65.00%      
Line of Credit [Member] | VUHI [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Abstract]          
Basis spread on LIBOR [1],[6]   1.125%      
Line of Credit [Member] | Houston Electric [Member]          
Line of Credit Facility [Abstract]          
Ratio of indebtedness to net capital [4] 0.532 0.532      
Percentage on limitation of debt to total capitalization under covenant (in hundredths) [5]   65.00%      
Line of Credit [Member] | Houston Electric [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Abstract]          
Basis spread on LIBOR [6]   1.25%      
Line of Credit [Member] | CERC Corp [Member]          
Line of Credit Facility [Abstract]          
Ratio of indebtedness to net capital [4] 0.527 0.527      
Percentage on limitation of debt to total capitalization under covenant (in hundredths)   65.00%      
Line of Credit [Member] | CERC Corp [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Abstract]          
Basis spread on LIBOR [6]   1.125%      
Letter of Credit [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit $ 8 $ 8     7
Letter of Credit [Member] | Parent Company [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit [2] 8 8     6
Letter of Credit [Member] | VUHI [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit [3] 0 0     0
Letter of Credit [Member] | SIGECO [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit 7 7      
Letter of Credit [Member] | Houston Electric [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit 0 0     0
Letter of Credit [Member] | CERC Corp [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit 0 0     1
Commercial Paper [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit 1,221 1,221     2,278
Commercial Paper [Member] | Parent Company [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit [2] $ 638 $ 638     $ 1,633
Weighted average interest rate of debt [2] 0.19% 0.19%     1.95%
Commercial Paper [Member] | VUHI [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit [3] $ 176 $ 176     $ 268
Weighted average interest rate of debt [3] 0.19% 0.19%     2.08%
Commercial Paper [Member] | Houston Electric [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit $ 0 $ 0     $ 0
Weighted average interest rate of debt 0.00% 0.00%     0.00%
Commercial Paper [Member] | CERC Corp [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit $ 407 $ 407     $ 377
Weighted average interest rate of debt 0.17% 0.17%     1.94%
CERC Senior notes 4.50% due 2021 [Member] | CERC Corp [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued $ 593 $ 593      
Line of Credit Facility [Abstract]          
Debt Instrument, Redemption Price, Percentage 100.00%        
General Mortgage Bonds Due 2050 [Member] | Houston Electric [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued       $ 300  
Interest rate of debt       2.90%  
Long-term Debt       $ 296  
Variable rate term loan [Member] | VCC [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued $ 200 200      
Variable rate term loan [Member] | CenterPoint Energy [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued $ 1,000 1,000      
Repayments of Debt   300      
Variable rate term loan [Member] | VUHI [Member]          
Debt Instrument [Line Items]          
Repayments of Debt   300      
Variable rate term loan [Member] | VCC [Member]          
Debt Instrument [Line Items]          
Repayments of Debt   $ 200      
Senior Notes [Member] | VUHI [Member]          
Debt Instrument [Line Items]          
Interest rate of debt 6.28% 6.28%      
Repayments of Debt   $ 100      
Senior Notes [Member] | CERC Senior notes 4.50% due 2021 [Member] | CERC Corp [Member]          
Debt Instrument [Line Items]          
Interest rate of debt 4.50% 4.50%      
First Mortgage [Member] | SIGECO [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued $ 38 $ 38      
First Mortgage [Member] | Environmental Improvement Revenue Bonds, Mount Vernon, 0.875%, Series 2015 [Member] | SIGECO [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued 23 23      
First Mortgage [Member] | Environmental Improvement Revenue Bonds, Warrick County, 0.875%, Series 2015 [Member] | SIGECO [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued $ 15 $ 15      
First Mortgage [Member] | SIGECO 2020 First Mortgage Bonds Remarketing, 0.875%, Series 2015 [Member] | SIGECO [Member]          
Debt Instrument [Line Items]          
Interest rate of debt 0.875% 0.875%      
Debt Instrument, Initial Interest Rate, Stated Percentage 2.375% 2.375%      
Subsequent Event [Member] | Senior Notes [Member] | CERC Senior notes 1.75% due 2030 [Member] | CERC Corp [Member]          
Debt Instrument [Line Items]          
Principal amount of debt issued     $ 500    
Interest rate of debt     1.75%    
Long-term Debt     $ 495    
Subsequent Event [Member] | Senior Notes [Member] | CERC Senior notes 4.50% due 2021 [Member] | CERC Corp [Member]          
Debt Instrument [Line Items]          
Interest rate of debt     4.50%    
Maximum [Member] | Letter of Credit [Member] | Vectren [Member]          
Line of Credit Facility [Abstract]          
Long-term line of credit $ 50 $ 50      
[1] This credit facility was issued by VUHI, is guaranteed by SIGECO, Indiana Gas and VEDO and includes a $10 million swing line sublimit and a $20 million letter of credit sublimit. This credit facility backstops VUHI’s commercial paper program.
[2] CenterPoint Energy’s outstanding commercial paper generally has maturities of 60 days or less.
[3] This credit facility was issued by VUHI and is guaranteed by SIGECO, Indiana Gas and VEDO.
[4] As defined in the revolving credit facility agreements, excluding Securitization Bonds.
[5] For CenterPoint Energy and Houston Electric, the financial covenant limit will temporarily increase from 65% to 70% if Houston Electric experiences damage from a natural disaster in its service territory and CenterPoint Energy certifies to the administrative agent that Houston Electric has incurred system restoration costs reasonably likely to exceed $100 million in a consecutive 12-month period, all or part of which Houston Electric intends to seek to recover through securitization financing. Such temporary increase in the financial covenant would be in effect from the date CenterPoint Energy delivers its certification until the earliest to occur of (i) the completion of the securitization financing, (ii) the first anniversary of CenterPoint Energy’s certification or (iii) the revocation of such certification.
[6] Based on current credit ratings.