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Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($)
1 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Oct. 31, 2022
Oct. 05, 2022
Sep. 30, 2022
Sep. 06, 2022
May 27, 2022
Dec. 31, 2021
Debt Instrument [Line Items]                
Aggregate principal amount         $ 3,600,000,000      
Long-term Debt                
Debt Instrument [Line Items]                
Aggregate Principal Amount         1,330,000,000      
Letter of Credit                
Debt Instrument [Line Items]                
Long-term line of credit         11,000,000     $ 11,000,000
Parent Company                
Debt Instrument [Line Items]                
Aggregate principal amount         2,400,000,000      
Vectren | Letter of Credit                
Debt Instrument [Line Items]                
Long-term line of credit         1,000,000      
Vectren | Maximum | Letter of Credit                
Debt Instrument [Line Items]                
Long-term line of credit         20,000,000      
Senior Notes | CNP Senior Notes Due 2028 | Long-term Debt                
Debt Instrument [Line Items]                
Aggregate Principal Amount $ 350,000,000       $ 350,000,000      
Interest rate of debt (as a percent)         4.25%      
Debt instrument, redemption price (as a percent)   100.00%            
Accrued and unpaid interest 6,000,000              
Make-whole premium 34,000,000              
CERC                
Debt Instrument [Line Items]                
Aggregate principal amount         $ 900,000,000      
CERC | Long-term Debt                
Debt Instrument [Line Items]                
Aggregate Principal Amount         425,000,000      
CERC | Letter of Credit                
Debt Instrument [Line Items]                
Long-term line of credit         0     0
CERC | CERC Corp. senior notes                
Debt Instrument [Line Items]                
Aggregate Principal Amount             $ 302,000,000  
CERC | CERC Senior Notes 6.10% due 2035                
Debt Instrument [Line Items]                
Aggregate Principal Amount           $ 75,000,000    
CERC | CERC Senior Notes 6.10% due 2035 | Subsequent Event                
Debt Instrument [Line Items]                
Aggregate Principal Amount       $ 75,000,000        
Interest rate of debt (as a percent)       6.10%        
CERC | Senior Notes                
Debt Instrument [Line Items]                
Aggregate Principal Amount         1,000,000,000      
Houston Electric                
Debt Instrument [Line Items]                
Aggregate principal amount         300,000,000      
Houston Electric | Long-term Debt                
Debt Instrument [Line Items]                
Aggregate Principal Amount         300,000,000      
Houston Electric | Letter of Credit                
Debt Instrument [Line Items]                
Long-term line of credit         0     0
Houston Electric | General Mortgage Bonds Due 2023 | Subsequent Event                
Debt Instrument [Line Items]                
Interest rate of debt (as a percent)     5.60%          
Debt instrument, redemption price (as a percent)     100.00%          
Principal amount to be redeemed     $ 200,000,000          
Houston Electric | General Mortgage Bonds                
Debt Instrument [Line Items]                
Aggregate Principal Amount         1,600,000,000      
Secured debt         6,300,000,000      
General mortgage bonds used as collateral         68,000,000      
Additional first mortgage bonds and general mortgage bonds that could be issued         $ 4,300,000,000      
Percentage of property additions (as a percent)         70.00%      
Houston Electric | General Mortgage Bonds | General Mortgage Bonds Due 2023 | Subsequent Event | Long-term Debt                
Debt Instrument [Line Items]                
Accrued and unpaid interest     3,000,000          
Make-whole premium     2,000,000          
Debt Instrument, Total Redemption Price     $ 205,000,000          
VUHI                
Debt Instrument [Line Items]                
Line of credit facility restated amount 400,000,000              
VUHI | VUH PPNs                
Debt Instrument [Line Items]                
Aggregate Principal Amount             $ 302,000,000  
Interest rate of debt (as a percent)           6.10%    
VUHI | VUHI PPNs                
Debt Instrument [Line Items]                
Repayments of debt $ 302,000,000              
Third Party AMAs                
Debt Instrument [Line Items]                
Inventory financings         $ 14,000,000     7,000,000
Third Party AMAs | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses                
Debt Instrument [Line Items]                
Inventory financings               36,000,000
Third Party AMAs | CERC                
Debt Instrument [Line Items]                
Inventory financings         $ 14,000,000     7,000,000
Third Party AMAs | CERC | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses                
Debt Instrument [Line Items]                
Inventory financings               $ 36,000,000