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Short-Term Debt And Liquidity (Tables)
 12 Months Ended
Dec. 31, 2011
Short-Term Debt And Liquidity [Abstract]  
Borrowing Activity On Credit Agreements

2010 Missouri Credit Agreement ($800 million)

    Ameren (Parent)     Ameren Missouri      Total  

2011:

        

Average daily borrowings outstanding during 2011

    $ 105      $ —         $ 105   

Outstanding credit facility borrowings at period end

      —          —           —     

Weighted-average interest rate during 2011

      2.30 %      —           2.30 % 

Peak credit facility borrowings during 2011(a )

   $ 340      $ —         $ 340   

Peak interest rate during 2011

      4.30 %      —           4.30 % 

2010:

        

Average daily borrowings outstanding during 2010(b )

   $ 195      $ —         $ 195   

Outstanding credit facility borrowings at period end

      340        —           340   

Weighted-average interest rate during 2010( b)

     2.31 %      —           2.31 % 

Peak credit facility borrowings during 2010(a)(b)

   $ 380      $ —         $ 380   

Peak interest rate during 2010(b )

     2.31 %      —           2.31 % 

 

(a) The timing of peak credit facility borrowings varies by company and therefore the amounts presented by company might not equal the total peak credit facility borrowings for the period. The simultaneous peak credit facility borrowings by the Ameren Companies under all credit facilities during 2011 and 2010 were $460 million and $925 million, respectively.
(b) Calculated from the September 10, 2010, inception date through December 31, 2010.

The following table summarizes the borrowing activity and relevant interest rates under the 2010 Genco Credit Agreement described below for the year ended December 31, 2011:

 

2010 Genco Credit Agreement ($500 million)

    Ameren (Parent)     Genco     Total  

2011:

       

Average daily borrowings outstanding during 2011

    $ —        $ 41      $ 41   

Outstanding credit facility borrowings at period end

      —          —          —     

Weighted-average interest rate during 2011

      —          2.30 %      2.30 % 

Peak credit facility borrowings during 2011(a)

   $ —        $ 100      $ 100   

Peak interest rate during 2011

      —          2.31 %      2.31 % 

2010 Genco Credit Agreement ($500 million)

    Ameren (Parent)     Genco     Total  

2010:

       

Average daily borrowings outstanding during 2010(b )

   $ 36      $ 54      $ 90   

Outstanding credit facility borrowings at period end

      —          100        100   

Weighted-average interest rate during 2010(b )

     2.30 %      2.31 %      2.31 % 

Peak credit facility borrowings during 2010(a)(b)

   $ 385      $ 100      $ 385   

Peak interest rate during 2010(b )

     2.31 %      2.31 %      2.31 % 

 

(a) The timing of peak credit facility borrowings varies by company, and therefore the amounts presented by company might not equal the total peak credit facility borrowings for the period. The simultaneous peak credit facility borrowings by the Ameren Companies under all credit facilities during 2011 and 2010 were $460 million and $925 million, respectively.
(b) Calculated from the September 10, 2010, inception date through December 31, 2010.
Schedule Of Maximum Aggregate Amount Available On Credit Agreements
     2010
Missouri
Credit
Agreement		     2010
Genco
Credit
Agreement		     2010
Illinois
Credit
Agreement		  

Ameren

    $ 500      $ 500      $ 300   

Ameren Missouri

      500        (a )      (a ) 

Ameren Illinois

      (a )      (a )      800   

Genco

      (a )      500        (a ) 

 

(a) Not applicable.