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Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Letter of Credit    
Debt Instrument [Line Items]    
Long-term line of credit $ 11 $ 11
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 | Letter of Credit    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
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 $ 4,400  
Percentage of property additions (as a percent) 70.00%  
VUHI    
Debt Instrument [Line Items]    
Line of credit facility restated amount $ 400  
Third Party AMAs    
Debt Instrument [Line Items]    
Inventory financings 7 7
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
Third Party AMAs | CERC    
Debt Instrument [Line Items]    
Inventory financings $ 7 7
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