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Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 15, 2021
Feb. 28, 2021
Jan. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Inventory financings $ 3       $ 24
Size of credit facility 4,000        
Letter of Credit          
Debt Instrument [Line Items]          
Long-term line of credit 11       11
Parent Company          
Debt Instrument [Line Items]          
Size of credit facility 2,400   $ 2,400 $ 3,300  
Vectren | Letter of Credit          
Debt Instrument [Line Items]          
Long-term line of credit 1        
Vectren | Maximum | Letter of Credit          
Debt Instrument [Line Items]          
Long-term line of credit 20        
CERC Corp          
Debt Instrument [Line Items]          
Inventory financings 3       24
Size of credit facility 900        
CERC Corp | Letter of Credit          
Debt Instrument [Line Items]          
Long-term line of credit 0       0
Houston Electric          
Debt Instrument [Line Items]          
Size of credit facility 300        
General mortgage bonds used as collateral $ 68        
Percentage of property additions 70.00%        
First Mortgage Bond Outstanding   $ 0      
Additional first mortgage bonds and general mortgage bonds that could be issued $ 3,700        
Houston Electric | Letter of Credit          
Debt Instrument [Line Items]          
Long-term line of credit 0       $ 0
Houston Electric | Bonds General Mortgage Due Range 1          
Debt Instrument [Line Items]          
Secured Debt $ 5,000