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Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Size of credit facility $ 4,000  
Third Party AMAs    
Debt Instrument [Line Items]    
Inventory financings 0 $ 7
Third Party AMAs | Arkansas and Oklahoma Natural Gas Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations    
Debt Instrument [Line Items]    
Inventory financings   36
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  
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]    
Size of credit facility 900  
CERC Corp | Third Party AMAs    
Debt Instrument [Line Items]    
Inventory financings 0 7
CERC Corp | Third Party AMAs | Arkansas and Oklahoma Natural Gas Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations    
Debt Instrument [Line Items]    
Inventory financings   36
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  
Houston Electric | Letter of Credit    
Debt Instrument [Line Items]    
Long-term line of credit 0 $ 0
Houston Electric | General Mortgage Bonds    
Debt Instrument [Line Items]    
Secured Debt 5,800  
General mortgage bonds used as collateral 68  
Additional first mortgage bonds and general mortgage bonds that could be issued $ 4,100  
Percentage of property additions 70.00%