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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The Registrants reported the following effective tax rates:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
CenterPoint Energy
15
%
 
36
%
 
27
%
 
36
%
Houston Electric
21
%
 
36
%
 
22
%
 
36
%
CERC
22
%
 
35
%
 
22
%
 
37
%