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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2011
Open Gross Derivative Volumes by Commodity Type
                                                                 
      Quantity (in millions, except as indicated)  
Commodity   

NPNS

Contracts(a)

     Cash Flow
Hedges(b)		     Other
Derivatives(c)		     Derivatives That Qualify for
Regulatory Deferral(d)		  
     2011     2010     2011     2010     2011     2010     2011     2010  

Coal (in tons)

                                                                 

AMO

      36        46        (e )      (e )      (e )      (e )      (e )      (e ) 

Genco

      24        21        (e )      (e )      (e )      (e )      (e )      (e ) 

Other(f)

      6        6        (e )      (e )      (e )      (e )      (e )      (e ) 

Ameren

                     66                        73                        (e )                      (e )                      (e )                      (e )                      (e )                      (e ) 

Heating oil (in gallons)

                                                                 

AMO

      (e )      (e )      (e )      (e )      (e )      (e )      62        80   

Genco

      (e )      (e )      (e )      (e )      31        43        (e )      (e ) 

Other(f)

      (e )      (e )      (e )      (e )      9        12        (e )      (e ) 

Ameren

     (e )      (e )      (e )      (e )      40        55        62        80   

Natural gas (in mmbtu)

                                                                 

AMO

      10        13        (e )      (e )      3        2        21        21   

AIC

      62        85        (e )      (e )      (e )      (e )      175        173   

Genco

      (e )      (e )      (e )      (e )      3        3        (e )      (e ) 

Other(f)

      (e )      (e )      (e )      (e )      20        16        (e )      (e ) 

Ameren

     72        98        (e )      (e )      26        21        196        194   

Power (in megawatthours)

                                                                 

AMO

      2        2        (e )      (e )      1        1        3        5   

AIC

      12        (e )      (e )      (e )      (e )      (e )      31        26   

Genco

      (e )      (e )      (e )      (e )      2        3        (e )      (e ) 

Other(f)

      65        61        21        2        51        57        (14 )      (13 ) 

Ameren

     79        63        21        2        54        61        20        18   

Uranium (pounds in thousands)

                                                                 

AMO

      5,710        5,810        (e )      (e )      (e )      (e )      458        185   

Ameren

      5,710        5,810        (e )      (e )      (e )      (e )      458        185   

 

(a) Contracts through December 2014, March 2015, September 2035, and October 2024 for coal, natural gas, power, and uranium, respectively, as of June 30, 2011.
(b) Contracts through December 2013 for power as of June 30, 2011.
(c) Contracts through December 2013, December 2012, and May 2015 for heating oil, natural gas, and power, respectively, as of June 30, 2011.
(d) Contracts through December 2013, October 2016, May 2032 and December 2013 for heating oil, natural gas, power, and uranium, respectively, as of June 30, 2011.
(e) Not applicable.
(f) Includes AERG coal and heating oil, Marketing Company natural gas and power, and intercompany eliminations' for power.
Derivative Instruments Carrying Value
                                     
      Balance Sheet Location   

Ameren(a)

      Ameren Missouri     Ameren Illinois     Genco  

2011:

                                  

Derivative assets designated as hedging instruments

                                  

Commodity contracts:

                                       

Power

    MTM derivative assets    $ 5       $ -      $ (b )    $ -   
    

Other assets

      2         -        -        -   
    

Total assets

    $ 7       $ -      $ -      $ -   

Derivative liabilities designated as hedging instruments

                                  

Commodity contracts:

                                       

Power

    MTM derivative liabilities    $ 3       $ (b )    $ -      $ -   
    

Other deferred credits and liabilities

      4         -        -        -   
    

Total liabilities

    $ 7       $ -      $ -      $ -   

Derivative assets not designated as hedging instruments(c)

                                  

Commodity contracts:

                                       

Heating oil

    MTM derivative assets    $ 49       $ 29      $ (b )    $ 15   
    

Other assets

      23         14        -        7   

Natural gas

    MTM derivative assets      5         -        (b )      1   
    

Other current assets

      -         -        2        -   
    

Other assets

      1         -        -        -   

Power

    MTM derivative assets      100         29        (b )      4   
    

Other current assets

      -         -        1        -   
    

Other assets

      85         1        68        -   
    

Total assets

    $ 263       $ 73      $ 71      $ 27   

Derivative liabilities not designated as hedging instruments(c)

                                  

Commodity contracts:

                                       

Heating oil

    MTM derivative liabilities    $ 4       $ (b )    $ -      $ 1   
    

Other current liabilities

      -         2        -        -   

Natural gas

    MTM derivative liabilities      75         (b )      60        2   
    

Other current liabilities

      -         10        -        -   
    

Other deferred credits and liabilities

      63         10        53        -   

Power

    MTM derivative liabilities      52         (b )      4        2   
    

MTM derivative liabilities - affiliates

      -         (b )      173        1   
    

Other current liabilities

      -         3        -        -   
    

Other deferred credits and liabilities

      14         1        96        -   

Uranium

    MTM derivative liabilities      1         (b )      -        -   
    

Other current liabilities

      -         1        -        -   
    

Other deferred credits and liabilities

      1         1        -        -   
    

Total liabilities

    $ 210       $ 28      $ 386      $ 6   

2010:

                                       

Derivative assets designated as hedging instruments

                                  

Commodity contracts:

                                       

Power

    MTM derivative assets    $ 3       $ -      $ (b )    $ -   
     Other assets      2         -        -        -   
    

Total assets

    $ 5       $ -      $ -      $ -   

Derivative liabilities designated as hedging instruments

                                  

Commodity contracts:

                                       

Power

    MTM derivative liabilities    $ 1       $ (b )    $ -      $ -   
    

Total liabilities

    $                           1       $ -      $ -      $                          -   
      Balance Sheet Location   

Ameren(a)

    

Ameren Missouri

    

Ameren Illinois

    

Genco

  

Derivative assets not designated as hedging instruments(c)

                                 

Commodity contracts:

                                      

Heating oil

    MTM derivative assets    $ 42      $ 24      $ (b )    $ 14   
     Other current assets      -        -        -        -   
     Other assets      22        13        -        7   

Natural gas

    MTM derivative assets      4        1        (b )      1   
     Other current assets      -        -        1        -   
     Other assets      1        -        1        -   

Power

    MTM derivative assets      78        8        (b )      11   
     Other current assets      -        -        2        -   
     Other assets      20        -        6        -   

Uranium

    MTM derivative assets      2        2        (b )      -   
     Other current assets      -        -        -        -   
     Total assets    $ 169      $ 48      $ 10      $ 33   

Derivative liabilities not designated as hedging instruments(c)

                                 

Commodity contracts:

                                      

Heating oil

    MTM derivative liabilities    $ 12      $ (b )    $ -      $ 4   
     Other current liabilities      -        7        -        -   
     Other deferred credits and liabilities      1        -        -        -   

Natural gas

    MTM derivative liabilities      87        (b )      73        2   
     Other current liabilities      -        11        -        -   
     Other deferred credits and liabilities      84        13        70        -   

Power

    MTM derivative liabilities      61        (b )      9        3   
     MTM derivative liabilities - affiliates      (b )      (b )      172        5   
     Other current liabilities      -        6        -        -   
     Other deferred credits and liabilities      7        -        179        -   
     Total liabilities    $                        252      $ 37      $ 503      $                        14   

 

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.
(b) Balance sheet line item not applicable to registrant.
(c) Includes derivatives subject to regulatory deferral.
Cumulative Pretax Net Gains (Losses) on All Derivative Instruments Reported in the Statement of Financial Position
                                         
     

Ameren(a)

    

Ameren Missouri

    

Ameren Illinois

    

Genco

    

Other(a)

  

2011:

                                         

Cumulative gains (losses) deferred in accumulated OCI:

                                         

Power derivative contracts(b)

    $ 3      $ -      $ -      $ -      $ 3   

Interest rate derivative contracts(c)(d)

     (9 )      -        -        (9 )      -   

Cumulative gains (losses) deferred in regulatory liabilities or assets:

                                         

Heating oil derivative contracts(e)

      35        35        -        -        -   

Natural gas derivative contracts(f)

      (131 )      (20 )      (111 )      -        -   

Power derivative contracts(g)

      91        26        (204 )      -        269   

Uranium derivative contracts(h)

      (2 )      (2 )      -        -        -   

2010:

                                         

Cumulative gains (losses) deferred in accumulated OCI:

                                         

Power derivative contracts(b)

    $ 8      $ -      $ -      $ -      $ 8   

Interest rate derivative contracts(c)(d)

     (9 )      -        -        (9 )      -   

Cumulative gains (losses) deferred in regulatory liabilities or assets:

                                         

Heating oil derivative contracts(e)

      19        19        -        -        -   

Natural gas derivative contracts(f)

      (165 )      (24 )      (141 )      -        -   

Power derivative contracts(g)

      1        3        (352 )      -        350   

Uranium derivative contracts(h)

      2        2        -        -        -   

 

(a) Includes amounts for Marketing Company and intercompany eliminations.
(b) Represents net gains associated with power derivative contracts at Ameren. These contracts are a partial hedge of electricity price exposure through December 2013 as of June 30, 2011. Current gains of $3 million and $8 million were recorded at Ameren as of June 30, 2011, and December 31, 2010, respectively.
(c) Includes net gains associated with interest rate swaps at Genco that were a partial hedge of the interest rate on debt issued in June 2002. The swaps cover the first 10 years of debt that has a 30-year maturity, and the gain in OCI is amortized over a 10-year period that began in June 2002. The carrying value at June 30, 2011, and December 31, 2010, was less than $1 million and less than $1 million, respectively. The balance of the gain will be amortized by June 2012.
(d) Includes net losses associated with interest rate swaps at Genco. The swaps were executed during the fourth quarter of 2007 as a partial hedge of interest rate risks associated with Genco's April 2008 debt issuance. The loss on the interest rate swaps is being amortized over a 10-year period that began in April 2008. The carrying value at June 30, 2011, and December 31, 2010, was a loss of $9 million and $10 million, respectively. Over the next twelve months, $1.4 million of the loss will be amortized.
(e)

Represents net gains on heating oil derivative contracts at Ameren Missouri. These contracts are a partial hedge of Ameren Missouri's transportation costs for coal through December 2013 as of June 30, 2011. Current gains deferred as regulatory liabilities include $24 million and $24 million at Ameren and Ameren Missouri as of June 30, 2011, respectively. Current losses deferred as regulatory assets include $2 million and $2 million at Ameren and Ameren Missouri as of June 30, 2011, respectively. Current gains deferred as regulatory liabilities include $13 million and $13 million at Ameren and Ameren Missouri as of December 31, 2010, respectively. Current losses deferred as regulatory assets include $6 million and $6 million at Ameren and Ameren Missouri as of December 31, 2010, respectively.

(f) Represents net losses associated with natural gas derivative contracts. These contracts are a partial hedge of natural gas requirements through October 2016 at Ameren, Ameren Missouri, and Ameren Illinois, in each case as of June 30, 2011. Current gains deferred as regulatory liabilities include $2 million and $2 million at Ameren and Ameren Illinois, respectively, as of June 30, 2011. Current losses deferred as regulatory assets include $69 million, $9 million, and $60 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of June 30, 2011. Current gains deferred as regulatory liabilities include $1 million and $1 million at Ameren and Ameren Missouri, respectively, as of December 31, 2010. Current losses deferred as regulatory assets include $84 million, $11 million, and $73 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of December 31, 2010.
(g) Represents net gains associated with power derivative contracts. These contracts are a partial hedge of power price requirements through May 2032 at Ameren and Ameren Illinois and through December 2012 at Ameren Missouri, in each case as of June 30, 2011. Current gains deferred as regulatory liabilities include $29 million, $28 million, and $1 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of June 30, 2011. Current losses deferred as regulatory assets include $5 million, $2 million, and $177 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of June 30, 2011. Current gains deferred as regulatory liabilities include $8 million, $6 million, and $2 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of December 31, 2010. Current losses deferred as regulatory assets include $13 million, $3 million, and $181 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of December 31, 2010.
(h) Represents net losses and gains on uranium derivative contracts at Ameren Missouri. These contracts are a partial hedge of our uranium requirements through December 2013 as of June 30, 2011. Current losses deferred as regulatory assets include $1 million and $1 million at Ameren and Ameren Missouri as of June 30, 2011, respectively. Current gains deferred as regulatory liabilities include $2 million and $2 million at Ameren and Ameren Missouri as of December 31, 2010, respectively.
Cash Collateral Held From Counterparties
                                                                         
      Affiliates(a)     

Coal

Producers

     

Commodity

Marketing

Companies

     

Electric

Utilities

     

Financial

Companies

     

Municipalities/

Cooperatives

     

Oil and Gas

Companies

     

Retail

Companies

      Total  

2011:

                                                                                 

Ameren(a)

    $ -       $ -       $ -       $ -       $ -       $ -       $ -       $ -       $  -    

2010:

                                                                                 

Ameren(a)

    $ -       $ -       $ -       $ -       $ -       $ -       $ -       $ 1       $ 1    

 

(a) Represents amounts held by Marketing Company. As of June 30, 2011, and December 31, 2010, Ameren registrant subsidiaries held no cash collateral.
Potential Loss on Counterparty Exposures
                                                                         
      Affiliates(a)     

Coal

Producers

     

Commodity
Marketing

Companies

     

Electric

Utilities

     

Financial

Companies

     

Municipalities/

Cooperatives

     

Oil and Gas

Companies

     

Retail

Companies

      Total  

2011:

                                                                                 

AMO

    $ -       $ 10       $ 1       $ 3       $ 33       $ 7       $ -       $ -       $ 54   

AIC

      -         -         27         -         -         -         -         -         27   

Genco

      -         4         1         -         1         -         3         -         9   

Other(b)

      317         4         6         5         35         205         -         67         639   

Ameren

     317         18         35         8         69         212         3         67         729   

2010:

                                                                                 

AMO

    $ -       $ 8       $ -       $ 1       $ 2       $ 10       $ -       $ -       $ 21   

AIC

      -         -         2         -         -         -         -         -         2   

Genco

      -         1         1         1         1         -         5         -         9   

Other(b)

      404         1         8         7         56         513         2         71         1,062   

Ameren

     404         10         11         9         59         523         7         71         1,094   

 

(a) Primarily comprised of Marketing Company's exposure to Ameren Illinois related to financial contracts. The exposure is not eliminated at the consolidated Ameren level as it is calculated without regard to the offsetting affiliate counterparty's liability position. See Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K for additional information on these financial contracts.
(b) Includes amounts for Marketing Company, AERG, and AFS.
Derivative Instruments With Credit Risk-Related Contingent Features
                         
     

Aggregate Fair Value of

Derivative Liabilities(a)

     

Cash

Collateral Posted

      Potential Aggregate Amount of  Additional
Collateral Required(b)		  

2011:

                           

Ameren Missouri

    $ 113       $ 5         $                         67   

Ameren Illinois

      207         91         103   

Genco

      49         5         26   

Other(c)

      121         13         59   

Ameren

     490         114         255   

2010:

                           

Ameren Missouri

    $ 105       $ 7         $                        93   

Ameren Illinois

      233         109         111   

Genco

      31         -         28   

Other(c)

      62         18         42   

Ameren

     431         134         274   

 

(a) Prior to consideration of master trading and netting agreements and including NPNS contract exposures.
(b) As collateral requirements with certain counterparties are based on master trading and netting agreements, the aggregate amount of additional collateral required to be posted is after consideration of the effects of such agreements.
(c) Includes amounts for Marketing Company and Ameren (parent).
Cash Flow Hedges
                                 
     

Gain (Loss)

Recognized in
OCI(a)

    

Location of (Gain) Loss

Reclassified from

OCI into Income(b)

   

(Gain) Loss

Reclassified from

OCI into Income(b)

    

Location of Gain (Loss)

Recognized in Income(c)

   

Gain (Loss)

Recognized

in Income(c)

  

                             Three Months

 

                          

2011:

                                   

Ameren:(d)

                                   

Power

    $ (3 )    Operating Revenues - Electric    $ 1      Operating Revenues - Electric    $ 3   

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

Genco:

                                   

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

2010:

                                   

Ameren:(d)

                                   

Power

    $ (16 )    Operating Revenues - Electric    $ (10 )    Operating Revenues - Electric    $ (13 ) 

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

Genco:

                                   

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

                             Six Months

 

                          

2011:

                                   

Ameren:(d)

                                   

Power

    $ (7 )    Operating Revenues - Electric    $ 2      Operating Revenues - Electric    $ 2   

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

Genco:

                                   

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

2010:

                                   

Ameren:(d)

                                   

Power

    $ 10      Operating Revenues - Electric    $ (14 )    Operating Revenues - Electric    $ (13 ) 

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

Genco:

                                   

Interest rate(e)

      -      Interest Charges      (f )    Interest Charges      -   

 

(a) Effective portion of gain (loss).
(b) Effective portion of (gain) loss on settlements.
(c) Ineffective portion of gain (loss) and amount excluded from effectiveness testing.
(d) Includes amounts from Ameren registrant and nonregistrant subsidiaries.
(e) Represents interest rate swaps settled in prior periods. The cumulative gain and loss on the interest rate swaps is being amortized into income over a 10-year period.
(f) Less than $1 million.
Other Derivatives
                                             
           

Location of Gain (Loss)

Recognized in Income

   

Gain (Loss)

Recognized in Income

  
               Three Months          Six Months  
                  2011     2010           2011     2010  
Ameren(a)    Heating oil    Operating Expenses - Fuel    $ (9 )    $ (7 )         $ 10      $ (6 ) 
     Natural gas (generation)    Operating Expenses - Fuel      -        -             -        (1 ) 
     Power    Operating Revenues - Electric      (5 )      (11 )           (7 )      20   
         

Total

    $ (14 )    $ (18 )         $ 3      $ 13   
Ameren Missouri    Natural gas (generation)    Operating Expenses - Fuel    $ -      $ -           $ (1 )    $ 1   
    

Power

    Operating Revenues - Electric      -        -             -        (1 ) 
          Total    $ -      $ -           $ (1 )    $ -   
Genco    Heating oil    Operating Expenses - Fuel    $ (8 )    $ (5 )         $ 7      $ (4 ) 
    

Natural gas (generation)

    Operating Expenses - Fuel      -        -             -        (1 ) 
    

Power

    Operating Revenues      (1 )      -             (1 )      1   
          Total    $ (9 )    $ (5 )         $ 6      $ (4 ) 

 

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.
Derivatives that Qualify for Regulatory Deferral
                                         
            Gain (Loss) Recognized in Regulatory  Liabilities or Regulatory Assets  
          Three Months          Six Months  
            2011     2010           2011     2010  

Ameren(a)

    Heating oil    $ (13 )    $ (9 )         $ 16      $ (8 ) 
    

Natural gas

      3        25             34        (81 ) 
    

Power

      88        33             90        23   
    

Uranium

      (3 )      (1 )           (4 )      (2 ) 
    

Total

    $ 75      $ 48           $ 136      $ (68 ) 

Ameren Missouri            

    Heating oil    $ (13 )    $ (9 )         $ 16      $ (8 ) 
    

Natural gas

      1        4             4        (11 ) 
    

Power

      23        (9 )           23        7   
    

Uranium

      (3 )      (1 )           (4 )      (2 ) 
    

Total

    $ 8      $ (15 )         $ 39      $ (14 ) 

Ameren Illinois

    Natural gas    $ 2      $ 21           $ 30      $ (70 ) 
    

Power

      121        150             148        17   
    

Total

    $ 123      $ 171           $ 178      $ (53 ) 

 

(a) Includes amounts for intercompany eliminations.
Customer Concentration Risk [Member]
  
Maximum Exposure If Counterparties Fail To Perform on Contracts
                                                                         
      Affiliates(a)     

Coal

Producers

     

Commodity

Marketing

Companies

     

Electric

Utilities

     

Financial

Companies

     

Municipalities/

Cooperatives

     

Oil and Gas

Companies

     

Retail

Companies

      Total  

2011:

                                                                                 

AMO

    $ -       $ 22       $ 2       $ 5       $ 39       $ 7       $ -       $ -       $ 75    

AIC

      -         -         29         -         2         -         -         -         31    

Genco

      -         12         1         1         3         -         4         -         21    

Other(b)

      333         7         7         10         47         217         1         68         690    

Ameren

     333         41         39         16         91         224         5         68         817    

2010:

                                                                                 

AMO

    $ -       $ 21       $ 1       $ 2       $ 5       $ 11       $ 1       $ -       $ 41    

AIC

      -         -         3         -         1         -         -         -         4    

Genco

      -         6         2         1         1         -         6         -         16    

Other(b)

      410         3         10         19         65         539         3         72         1,121    

Ameren

     410         30         16         22         72         550         10         72         1,182    

 

(a) Primarily comprised of Marketing Company's exposure to Ameren Illinois related to financial contracts. The exposure is not eliminated at the consolidated Ameren level as it is calculated without regard to the offsetting affiliate counterparty's liability position. See Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K for additional information on these financial contracts.
(b) Includes amounts for Marketing Company, AERG, and AFS.