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Fair Value Measurements
3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block]
Fair Value Measurements

Assets and liabilities that are recorded at fair value in the Condensed Consolidated Balance Sheets are categorized based upon the level of judgment associated with the inputs used to measure their value. Hierarchical levels, as defined below and directly related to the amount of subjectivity associated with the inputs to fair valuations of these assets and liabilities, are as follows:

Level 1: Inputs are unadjusted quoted prices in active markets for identical assets or liabilities at the measurement date. The types of assets carried at Level 1 fair value are investments listed in active markets.  At March 31, 2016 and December 31, 2015, Houston Electric held Level 1 investments of $34 million and $32 million, respectively, which were primarily investments in money market funds and are included in other current assets in the Condensed Consolidated Balance Sheets.

Level 2:  Inputs, other than quoted prices included in Level 1, are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar instruments in active markets, and inputs other than quoted prices that are observable for the asset or liability. Houston Electric had no Level 2 assets or liabilities at either March 31, 2016 or December 31, 2015.

Level 3: Inputs are unobservable for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. Unobservable inputs reflect Houston Electric’s judgments about the assumptions market participants would use in determining fair value.  Houston Electric had no Level 3 assets or liabilities at either March 31, 2016 or December 31, 2015.

Houston Electric determines the appropriate level for each financial asset and liability on a quarterly basis and recognizes transfers between levels at the end of the reporting period. For the three months ended March 31, 2016, there were no transfers between levels.

Estimated Fair Value of Financial Instruments

The fair values of cash and cash equivalents and short-term borrowings are estimated to be approximately equivalent to carrying amounts and have been excluded from the table below.  The fair value of each debt instrument is determined by multiplying the principal amount of each debt instrument by the market price. These assets and liabilities, which are not measured at fair value in the Condensed Consolidated Balance Sheets, but for which the fair value is disclosed, would be classified as Level 1 in the fair value hierarchy.
 
March 31, 2016
 
December 31, 2015
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Financial liabilities:
(in millions)
Long-term debt
$
4,714

 
$
5,067

 
$
4,859

 
$
5,086