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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
CENTERPOINT ENERGY HOUSTON ELECTRIC, LLC AND SUBSIDIARIES
(An Indirect, Wholly-Owned Subsidiary of CenterPoint Energy, Inc.)

SCHEDULE II —VALUATION AND QUALIFYING ACCOUNTS
For the Three Years Ended December 31, 2015


Column A
 
Column B
 
Column C
Column D
 
Column E
Description
 
Balance At
Beginning
of Period
 
Additions
Charged
to Income
 
Deductions
From
Reserves (1)
 
Balance At
End Of
Period
 
 
(in millions)
Year Ended December 31, 2015:
 
 
 
 
 
 
 
 
Accumulated provisions:
 
 
 
 
 
 
 
 
Uncollectible accounts receivable
 
$
3

 
$
—

 
$
2

 
$
1

Year Ended December 31, 2014:
 
 

 
 

 
 

 
 

Accumulated provisions:
 
 

 
 

 
 

 
 

Uncollectible accounts receivable
 
$
3

 
$
3

 
$
3

 
$
3

Year Ended December 31, 2013:
 
 

 
 

 
 

 
 

Accumulated provisions:
 
 

 
 

 
 

 
 

Uncollectible accounts receivable
 
$
2

 
$
2

 
$
1

 
$
3

 
(1)
Deductions from reserves represent losses or expenses for which the respective reserves were created. In the case of the uncollectible accounts reserve, such deductions are net of recoveries of amounts previously written off.