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Fair Value Measurements
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair Value Measurements
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 generally are exchange-traded derivatives and equity securities.

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. Fair value assets and liabilities that are generally included in this category are derivatives with fair values based on inputs from actively quoted markets.  A market approach is utilized to value CERC's Level 2 assets or liabilities.

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. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Unobservable inputs reflect CERC's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. CERC develops these inputs based on the best information available, including CERC's own data. A market approach is utilized to value CERC's Level 3 assets or liabilities.

CERC determines the appropriate level for each financial asset and liability on a quarterly basis and recognizes any transfers at the end of the reporting period.  For the quarter ended September 30, 2011, there were no significant transfers between levels.
 
The following tables present information about CERC's assets and liabilities (including derivatives that are presented net) measured at fair value on a recurring basis as of December 31, 2010 and September 30, 2011, and indicate the fair value hierarchy of the valuation techniques utilized by CERC to determine such fair value.

   
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
  
Significant Other
Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Netting
Adjustments (1)
  
Balance
as of
December 31,
2010
 
   
(in millions)
 
Assets
               
Corporate equities
 $1  $-  $-  $-  $1 
Investments, including money
market funds
  11   -   -   -   11 
Natural gas derivatives
  -   73   7   (11)  69 
Total assets
 $12  $73  $7  $(11) $81 
Liabilities
                    
Natural gas derivatives
  8   167   4   (95)  84 
Total liabilities
 $8  $167  $4  $(95) $84 
        
 
(1)
Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $84 million posted with the same counterparties.

   
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
  
Significant Other
Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Netting
Adjustments (1)
  
Balance
as of
September 30,
2011
 
   
(in millions)
 
Assets
               
Corporate equities
 $1  $-  $-  $-  $1 
Investments, including money
market funds
  11   -   -   -   11 
Natural gas derivatives
  8   72   7   (23)  64 
Total assets
 $20  $72  $7  $(23) $76 
Liabilities
                    
Natural gas derivatives
  11   96   4   (55)  56 
Total liabilities
 $11  $96  $4  $(55) $56 
        
 
(1)
Amounts represent the impact of legally enforceable master netting agreements that allow CERC to settle positive and negative positions and also include cash collateral of $32 million posted with the same counterparties.
 
The following tables present additional information about assets or liabilities, including derivatives that are measured at fair value on a recurring basis for which CERC has utilized Level 3 inputs to determine fair value:
 
   
Fair Value Measurements Using Significant
Unobservable Inputs (Level 3)
 
   
Derivative assets and liabilities, net
 
   
Three Months Ended September 30,
 
   
2010
  
2011
 
   
(in millions)
 
Beginning balance
 $5  $5 
Total unrealized losses:
        
Included in earnings
  -   (1)
Total settlements, gross (1):
        
Included in earnings
  (2)  (1)
Ending balance
 $3  $3 
The amount of total gains (losses) for the period included in earnings
attributable to the change in unrealized gains or losses relating to
assets still held at the reporting date
 $1  $(1)
                 
 
(1)
During both the three months ended September 30, 2010 and 2011, CERC did not have Level 3 purchases or sales.

   
Fair Value Measurements Using Significant
Unobservable Inputs (Level 3)
 
   
Derivative assets and liabilities, net
 
   
Nine Months Ended September 30,
 
   
2010
  
2011
 
   
(in millions)
 
Beginning balance
 $(6) $3 
Total unrealized gains (losses):
        
Included in earnings
  2   3 
Included in regulatory assets
  (1)  - 
Total settlements, gross (1):
        
Included in earnings
  (1)  (3)
Included in regulatory assets
  9   - 
Ending balance
 $3  $3 
The amount of total gains for the period included in earnings
attributable to the change in unrealized gains or losses relating to
assets still held at the reporting date
 $4  $2 
                
 
(1)
During both the nine months ended September 30, 2010 and 2011, CERC did not have Level 3 purchases or sales.

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 values of non-trading derivative assets and liabilities are stated at fair value and are 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.

   
December 31, 2010
  
September 30, 2011
 
   
Carrying
Amount
  
Fair
Value
  
Carrying
Amount
  
Fair
Value
 
   
(in millions)
 
Financial liabilities:
            
Long-term debt
 $2,925  $3,158  $2,775  $3,091