XML 101 R67.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Regulatory Matters Houston Electric Base Rate Case (Details) - USD ($)
$ in Millions
Jan. 23, 2020
Apr. 05, 2019
Dec. 31, 2019
Dec. 31, 2018
Public Utilities, General Disclosures [Line Items]        
Non-current regulatory assets     $ 2,117 $ 1,967
CenterPoint Energy Houston Electric 2019 Rate Case [Member]        
Public Utilities, General Disclosures [Line Items]        
Revenue increase   $ 194    
Rate base   $ 6,400    
Debt capital structure   50.00%    
Equity capital structure   50.00%    
Return on equity   10.40%    
Houston Electric Stipulation and Settlement Agreement [Member] | Public Utility Commission of Texas [Member]        
Public Utilities, General Disclosures [Line Items]        
General mortgage bonds used as collateral     68  
Subsequent Event [Member] | Houston Electric Stipulation and Settlement Agreement [Member] | Public Utility Commission of Texas [Member]        
Public Utilities, General Disclosures [Line Items]        
Revenue increase $ 13      
Debt capital structure 57.50%      
Equity capital structure 42.50%      
Return on equity 9.40%      
Unprotected Excess Deferred Income Tax $ 105      
Rate Case Expense [Member] | Houston Electric Stipulation and Settlement Agreement [Member]        
Public Utilities, General Disclosures [Line Items]        
Non-current regulatory assets     $ 12