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Long-term Debt (Tables)
 9 Months Ended
Sep. 30, 2016
Line of Credit Facility [Line Items]  
Schedule of Line of Credit Facilities [Table Text Block]
Revolving Credit Facility. On March 4, 2016, Houston Electric announced that it had refinanced its existing $300 million revolving credit facility, which would have expired in 2019, with a new $300 million five-year senior unsecured revolving credit facility. As of September 30, 2016 and December 31, 2015, Houston Electric had the following revolving credit facility and utilization of such facility:

September 30, 2016
 
December 31, 2015
Size of
Facility
 
Loans
 
Letters
of Credit
 
Size of
Facility
 
Loans
 
Letters
of Credit
(in millions)
$
300

 
$
—

 
$
4

 
$
300

 
$
200

(1)
$
4


(1)
Weighted average interest rate was 1.637% as of December 31, 2015.