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Long-Term Debt and Equity Financings (Schedule of Debt Redemptions) (Details) (Ameren Illinois Company, USD $)
1 Months Ended
Jan. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Debt instrument face amount $ 1,000,000us-gaap_DebtInstrumentFaceAmount [1]    
Secured Debt | Senior Secured Notes 9.75% Due 2018
     
Debt Instrument [Line Items]      
Debt instrument face amount   313,000,000us-gaap_DebtInstrumentFaceAmount
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[2],[3] 313,000,000us-gaap_DebtInstrumentFaceAmount
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[2],[3]
Secured Debt | Series 1993 5.90% Due 2023
     
Debt Instrument [Line Items]      
Debt instrument face amount   1,000,000us-gaap_DebtInstrumentFaceAmount
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[4]  
Secured Debt | Senior Secured Notes 6.25% Due 2018
     
Debt Instrument [Line Items]      
Debt instrument face amount   144,000,000us-gaap_DebtInstrumentFaceAmount
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[2],[3] 144,000,000us-gaap_DebtInstrumentFaceAmount
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[2],[3]
Environmental Improvement And Pollution Control Revenue Bonds
     
Debt Instrument [Line Items]      
Redemptions of long-term debt 163,000,000us-gaap_RepaymentsOfLongTermDebt
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Environmental Improvement And Pollution Control Revenue Bonds | Series 1993 5.90% Due 2023
     
Debt Instrument [Line Items]      
Redemptions of long-term debt 32,000,000us-gaap_RepaymentsOfLongTermDebt
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[5]    
Debt instrument face amount   1,000,000us-gaap_DebtInstrumentFaceAmount
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[4],[6] 32,000,000us-gaap_DebtInstrumentFaceAmount
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[6]
Environmental Improvement And Pollution Control Revenue Bonds | Series 1994 A 5.70% Due 2024
     
Debt Instrument [Line Items]      
Redemptions of long-term debt 36,000,000us-gaap_RepaymentsOfLongTermDebt
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[5]    
Debt instrument face amount   1,000,000us-gaap_DebtInstrumentFaceAmount
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= aee_Series1994A570Due2024Member
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[1] 36,000,000us-gaap_DebtInstrumentFaceAmount
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[1]
Environmental Improvement And Pollution Control Revenue Bonds | Series C-1 1993 5.95% Due 2026
     
Debt Instrument [Line Items]      
Redemptions of long-term debt 35,000,000us-gaap_RepaymentsOfLongTermDebt
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Debt instrument face amount     35,000,000us-gaap_DebtInstrumentFaceAmount
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[7]
Environmental Improvement And Pollution Control Revenue Bonds | Series C-2 1993 5.70% Due 2026
     
Debt Instrument [Line Items]      
Redemptions of long-term debt 8,000,000us-gaap_RepaymentsOfLongTermDebt
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Debt instrument face amount     8,000,000us-gaap_DebtInstrumentFaceAmount
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[7]
Environmental Improvement And Pollution Control Revenue Bonds | Series1998A 5.40% Due 2028
     
Debt Instrument [Line Items]      
Redemptions of long-term debt 19,000,000us-gaap_RepaymentsOfLongTermDebt
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Debt instrument face amount     19,000,000us-gaap_DebtInstrumentFaceAmount
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[1]
Environmental Improvement And Pollution Control Revenue Bonds | Series1998B 5.40% Due 2028
     
Debt Instrument [Line Items]      
Redemptions of long-term debt 33,000,000us-gaap_RepaymentsOfLongTermDebt
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Debt instrument face amount     $ 33,000,000us-gaap_DebtInstrumentFaceAmount
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[1]
[1] These bonds are mortgage bonds issued by Ameren Illinois under the Ameren Illinois mortgage indenture and are secured by substantially all property of the former IP and CIPS. The bonds are callable at 100% of par value. The bonds are also backed by an insurance guarantee policy. Less than $1 million principal amount of the bonds remain outstanding.
[2] These notes are collaterally secured by mortgage bonds issued by Ameren Illinois under the Ameren Illinois mortgage indenture. The notes have a fall-away lien provision and will remain secured only as long as any series of first mortgage bonds issued under the Ameren Illinois mortgage indenture remain outstanding. Redemption, purchase, or maturity of all mortgage bonds, including first mortgage bonds currently outstanding and any that may be issued in the future, would result in a release of the mortgage bonds currently securing these notes, at which time these notes would become unsecured obligations. Considering the Ameren Illinois senior secured notes currently outstanding, we do not expect the mortgage bond lien protection associated with these notes to fall away until 2024.
[3] Ameren Illinois has agreed, during the life of these notes, not to optionally redeem, purchase, or otherwise retire in full its Ameren Illinois mortgage bonds; therefore, an Ameren Illinois first mortgage bond release date will not occur as long as any of these notes are outstanding.
[4] These bonds are first mortgage bonds issued by Ameren Missouri under the Ameren Missouri mortgage bond indenture and are secured by substantially all Ameren Missouri property and franchises. The bonds are callable at 100% of par value. Less than $1 million principal amount of the bonds remain outstanding.
[5] Less than $1 million principal amount of the bonds remain outstanding after redemption.
[6] These bonds are first mortgage bonds issued by Ameren Illinois under the CILCO mortgage indenture and are secured by substantially all property of the former CILCO. The bonds are callable at 100% of par value. Less than $1 million principal amount of the bonds remain outstanding.
[7] The bonds are callable at 100% of par value.