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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2011
Derivative Financial Instruments [Abstract]  
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)

                 

Ameren Missouri

      116        46        (e )      (e )      (e )      (e )      (e )      (e ) 

Genco

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

Other(f)

      7        6        (e )      (e )      (e )      (e )      (e )      (e ) 

Ameren

      147        73        (e )      (e )      (e )      (e )      (e )      (e ) 

Fuel oils (in gallons)(g)

                 

Ameren Missouri

      (e )      (e )      (e )      (e )      (e )      (e )      53        80   

Genco

      (e )      (e )      (e )      (e )      27        43        (e )      (e ) 

Other(f)

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

Ameren

      (e )      (e )      (e )      (e )      36        55        53        80   

Natural gas (in mmbtu)

                 

Ameren Missouri

      8        13        (e )      (e )      9        2        19        21   

Ameren Illinois

      42        85        (e )      (e )      (e )      (e )      174        173   

Genco

      (e )      (e )      (e )      (e )      7        3        (e )      (e ) 

Other(f)

      (e )      (e )      (e )      (e )      1        16        (e )      (e ) 

Ameren

      50        98        (e )      (e )      17        21        193        194   

Power (in megawatthours)

                 

Ameren Missouri

      1        2        (e )      (e )      1        1        6        5   

Ameren Illinois

      11        (e )      (e )      (e )      (e )      (e )      24        26   

Genco

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

Other(f)

      61        61        17        2        30        57        (9 )      (13 ) 

Ameren

      73        63        17        2        31        61        21        18   

Uranium (pounds in thousands)

                 

Ameren Missouri & Ameren

      5,553        5,810        (e )      (e )      (e )      (e )      148        185   

 

(a) Contracts through December 2017, March 2015, September 2035, and October 2024 for coal, natural gas, power, and uranium, respectively, as of December 31, 2011.
(b) Contracts through December 2014 for power as of December 31, 2011.
(c) Contracts through October 2014, December 2012, and December 2015 for fuel oils, natural gas, and power, respectively, as of December 31, 2011.
(d) Contracts through October 2014, October 2016, May 2032, and December 2013 for fuel oils, natural gas, power, and uranium, respectively, as of December 31, 2011.
(e) Not applicable.
(f) Includes AERG contracts for coal and fuel oils, Marketing Company contracts for natural gas and power, and intercompany eliminations for power.
(g) Fuel oils consist of heating and crude oil.
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      $ 8         $ (b )     $ (b )     $ -   
     Other assets        16           -         -         -   
     Total assets      $ 24         $ -       $ -       $ -   

Derivative liabilities designated as hedging instruments

                

Commodity contracts:

                   

Power

    Other deferred credits and liabilities      $ 1         $ -       $ -       $ -   
     Total liabilities      $ 1         $ -       $ -       $ -   

Derivative assets not designated as hedging instruments(c)

                

Commodity contracts:

                   

Fuel oils

    MTM derivative assets      $ 29         $ (b )     $ (b )     $ 10   
   Other current assets        -           17         -         -   
   Other assets        8           6         -         1   

Natural gas

    MTM derivative assets        6           (b )       (b )       2   
   Other current assets        -           2         1         -   
   Other assets        -           -         1         -   

Power

    MTM derivative assets        72           (b )       (b )       -   
   Other current assets        -           30         -         -   
     Other assets        99           -         77         -   
     Total assets      $         214         $         55       $         79       $         13   

Derivative liabilities not designated as hedging instruments(c)

              

Commodity contracts:

                 

Fuel oils

    MTM derivative liabilities      $ 2       $ (b )     $ -       $ 1   
   Other current liabilities        -         1         -         -   

Natural gas

    MTM derivative liabilities        106         (b )       90         2   
   Other current liabilities        -         13         -         -   
   Other deferred credits and liabilities        92         13         79         -   

Power

    MTM derivative liabilities        53         (b )       9         -   
   MTM derivative liabilities - affiliates        (b )       (b )       200         -   
   Other current liabilities        -         9         -         -   
   Other deferred credits and liabilities        26         -         8         -   

Uranium

    Other deferred credits and liabilities        1         1         -         -   
     Total liabilities      $ 280       $ 37       $ 386       $ 3   

2010:

                 

Derivative assets designated as hedging instruments

              

Commodity contracts:

                 

Power

    MTM derivative assets      $ 3       $ (b )     $ (b )     $ -   
     Other assets        2         -         -         -   
     Total assets      $ 5       $ -       $ -       $ -   

Derivative liabilities designated as hedging instruments

              

Commodity contracts:

                 

Power

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

Derivative assets not designated as hedging instruments(c)

              

Commodity contracts:

                 

Fuel oils

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

Natural gas

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

Power

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

Uranium

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

Derivative liabilities not designated as hedging instruments(c)

              

Commodity contracts:

                 

Fuel oils

    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 In OCI
        Ameren      Ameren
Missouri		      Ameren
Illinois		      Genco      Other(a)  

2011:

                 

Cumulative gains (losses) deferred in accumulated OCI:

                 

Power derivative contracts(b)

      $ 19       $ -       $ -       $ -       $ 19   

Interest rate derivative contracts(c)(d)

       (8 )       -         -         (8 )       -   

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

                 

Fuel oils derivative contracts(e)

        19         19         -         -         -   

Natural gas derivative contracts(f)

        (191 )       (24 )       (167 )       -         -   

Power derivative contracts(g)

        81         21         (140 )       -         200   

Uranium derivative contracts(h)

        (1 )       (1 )       -         -         -   

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:

                 

Fuel oils 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 2014 as of December 31, 2011. Current gains of $5 million and $8 million were recorded at Ameren as of December 31, 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 December 31, 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 December 31, 2011, and December 31, 2010, was a loss of $9 million and a loss of $10 million, respectively. Over the next 12 months, $1.4 million of the loss will be amortized.
(e) Represents net gains on fuel oils derivative contracts at Ameren Missouri. These contracts are a partial hedge of Ameren Missouri's transportation costs for coal through October 2014 as of December 31, 2011. Current gains deferred as regulatory liabilities include $16 million and $16 million at Ameren and Ameren Missouri as of December 31, 2011, respectively. Current losses deferred as regulatory assets include $1 million and $1 million at Ameren and Ameren Missouri as of December 31, 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 December 31, 2011. Current gains deferred as regulatory liabilities include $1 million and $1 million at Ameren and Ameren Illinois, respectively, as of December 31, 2011. Current losses deferred as regulatory assets include $101 million, $11 million, and $90 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of December 31, 2011. Current gains deferred as regulatory liabilities include $2 million, $1 million, and $1 million at Ameren, Ameren Missouri, and Ameren Illinois, 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 losses 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 2015 at Ameren Missouri, in each case as of December 31, 2011. Current gains deferred as regulatory liabilities include $29 million and $29 million at Ameren and Ameren Missouri, respectively, as of December 31, 2011. Current losses deferred as regulatory assets include $17 million, $8 million, and $209 million at Ameren, Ameren Missouri and Ameren Illinois, respectively, as of December 31, 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 gains(losses) on uranium derivative contracts at Ameren Missouri. These contracts are a partial hedge of our uranium requirements through December 2013 as of December 31, 2011. Current losses deferred as regulatory assets include less than $1 million and less than $1 million at Ameren and Ameren Missouri as of December 31, 2011, respectively. Current gains deferred as regulatory liabilities include $2 million at Ameren and $2 million at Ameren Missouri as of December 31, 2010.
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

    $ 1       $ 35       $ 1       $ 4       $ 26       $ 4       $ -       $ -       $ 71   

AIC

      -         -         84         -         1         -         -         -         85   

Genco

      -         1         1         2         6         -         3         -         13   

Other(b)

      275         1         3         10         51         194         -         87         621   

Ameren

    $         276       $             37       $             89       $             16       $             84       $             198       $             3       $             87       $         790   

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 composed of Marketing Company's exposure to Ameren Illinois related to financial contracts. The exposure is not eliminated at the consolidated Ameren level for purposes of this disclosure, as it is calculated without regard to the offsetting affiliate counterparty's liability position. See Note 14 – Related Party Transactions for additional information on these financial contracts.
(b) Includes amounts for Marketing Company, AERG, and AFS.
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

    $ 1       $ 35       $ 1       $ 3       $ 22       $ 4       $ -       $ -       $ 66   

AIC

      -         -         84         -         -         -         -         -         84   

Genco

      -         -         -         1         1         -         2         -         4   

Other(b)

      273         -         3         5         42         187         -         86         596   

Ameren

    $         274       $         35       $         88       $         9       $         65       $         191       $         2       $         86       $         750   

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 for purposes of this disclosure, as it is calculated without regard to the offsetting affiliate counterparty's liability position. See Note 14 – Related Party Transactions 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

    $         102       $ 8       $ 86   

Ameren Illinois

      220                 96                 125   

Genco

      55         1         58   

Other(c)

      79         11         63   

Ameren

    $ 456       $ 116       $ 332   

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 determined 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

Accumulated OCI into

Income(b)

  

(Gain) Loss

Reclassified from

Accumulated OCI

into Income(b)

     Location of Gain (Loss)
Recognized in Income(c)		  

Gain (Loss)
Recognized

in Income(c)

  

2011:                        

         

Ameren:(d)

          

Power

   $ 6      Operating Revenues - Electric   $         5      Operating Revenues - Electric   $ (10 ) 

Interest rate(e)

     -      Interest Charges     (f )    Interest Charges               -   

Genco:

          

Interest rate(e)

     -      Interest Charges     (f )    Interest Charges     -   

2010:

          

Ameren:(d)

          

Power

   $ (2 )    Operating Revenues - Electric   $ (14 )    Operating Revenues - Electric   $ (3 ) 

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 for 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

  
      2011     2010  

Ameren(a)

    Fuel oils    Operating Expenses - Fuel    $ (1 )    $ 9   
   Natural gas (generation)    Operating Expenses - Fuel      2        -   
     Power    Operating Revenues - Electric      (2 )      9   
          Total    $ (1 )    $ 18   

Ameren Missouri

    Natural gas (generation)    Operating Expenses - Fuel    $ (1 )    $ 1   

Genco

    Fuel oils    Operating Expenses - Fuel    $ (1 )    $ 7   
   Natural gas (generation)    Operating Expenses - Fuel      2        -   
     Power    Operating Revenues      (3 )      1   
          Total    $ (2 )    $ 8   

 

(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

  
   2011      2010  

Ameren(a)

    Fuel oils    $ -       $ 14   
   Natural gas      (26 )       (91 ) 
   Power      80         12   
     Uranium      (3 )       4   
     Total    $ 51       $ (61 ) 

Ameren

    Fuel oils    $ -       $ 14   

Missouri

    Natural gas      -         (11 ) 
   Power      18         4   
     Uranium      (3 )       4   
     Total    $ 15       $ 11   

Ameren

    Natural gas    $ (26 )     $ (80 ) 

Illinois

    Power      212         70   
     Total    $ 186       $ (10 ) 

 

(a) Includes amounts for intercompany eliminations.