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Other Income And Expenses (Other Income And Expenses) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Nonoperating Income (Expense) [Line Items]      
Allowance for equity funds used during construction $ 34us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity [1] $ 37us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity [1] $ 36us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity [1]
Interest income on industrial development revenue bonds 27us-gaap_InterestIncomeSecuritiesTaxExempt [1] 27us-gaap_InterestIncomeSecuritiesTaxExempt [1] 28us-gaap_InterestIncomeSecuritiesTaxExempt [1]
Interest and dividend income 10us-gaap_OtherInterestAndDividendIncome [1],[2] 3us-gaap_OtherInterestAndDividendIncome [1] 4us-gaap_OtherInterestAndDividendIncome [1],[3]
Other 8us-gaap_OtherIncome [1],[4] 2us-gaap_OtherIncome [1] 2us-gaap_OtherIncome [1]
Total miscellaneous income 79us-gaap_OtherNonoperatingIncome [1] 69us-gaap_OtherNonoperatingIncome [1] 70us-gaap_OtherNonoperatingIncome [1]
Donations 10aee_Donations [1] 12aee_Donations [1] 24aee_Donations [1],[5]
Other 12us-gaap_OtherNoninterestExpense [1] 14us-gaap_OtherNoninterestExpense [1] 13us-gaap_OtherNoninterestExpense [1]
Total miscellaneous expense 22us-gaap_OtherNonoperatingExpense [1] 26us-gaap_OtherNonoperatingExpense [1] 37us-gaap_OtherNonoperatingExpense [1]
Union Electric Company      
Other Nonoperating Income (Expense) [Line Items]      
Allowance for equity funds used during construction 32us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
31us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
31us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
Interest income on industrial development revenue bonds 27us-gaap_InterestIncomeSecuritiesTaxExempt
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
27us-gaap_InterestIncomeSecuritiesTaxExempt
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
28us-gaap_InterestIncomeSecuritiesTaxExempt
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
Interest and dividend income 1us-gaap_OtherInterestAndDividendIncome
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
  4us-gaap_OtherInterestAndDividendIncome
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
[3]
Total miscellaneous income 60us-gaap_OtherNonoperatingIncome
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
58us-gaap_OtherNonoperatingIncome
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
63us-gaap_OtherNonoperatingIncome
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
Donations 6aee_Donations
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
4aee_Donations
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
9aee_Donations
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
Other 6us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
7us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
5us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
Total miscellaneous expense 12us-gaap_OtherNonoperatingExpense
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
11us-gaap_OtherNonoperatingExpense
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
14us-gaap_OtherNonoperatingExpense
/ dei_LegalEntityAxis
= aee_UnionElectricCompanyMember
Ameren Illinois Company      
Other Nonoperating Income (Expense) [Line Items]      
Allowance for equity funds used during construction 2us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
6us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
5us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
Interest and dividend income 7us-gaap_OtherInterestAndDividendIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
[2] 2us-gaap_OtherInterestAndDividendIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
 
Other 8us-gaap_OtherIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
[4] 2us-gaap_OtherIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
2us-gaap_OtherIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
Total miscellaneous income 17us-gaap_OtherNonoperatingIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
10us-gaap_OtherNonoperatingIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
7us-gaap_OtherNonoperatingIncome
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
Donations 4aee_Donations
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
4aee_Donations
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
11aee_Donations
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
[5]
Other 4us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
5us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
6us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
Total miscellaneous expense 8us-gaap_OtherNonoperatingExpense
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
9us-gaap_OtherNonoperatingExpense
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
17us-gaap_OtherNonoperatingExpense
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
Illinois Science and Energy Innovation Trust | Ameren Illinois Company      
Other Nonoperating Income (Expense) [Line Items]      
One-time Donation     $ 7.5aee_OneTimeDonation
/ us-gaap_CounterpartyNameAxis
= aee_IllinoisScienceAndEnergyInnovationTrustMember
/ dei_LegalEntityAxis
= aee_AmerenIllinoisCompanyMember
[1] Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.
[2] Includes Ameren Illinois' interest income received in 2014 relating to the 2013 and 2014 IEIMA revenue requirement reconciliation regulatory assets.
[3] Includes Ameren Missouri's interest income relating to a refund of charges included in an expired power purchase agreement with Entergy. See Note 2 – Rate and Regulatory Matters for additional information.
[4] Includes Ameren Illinois' income earned in 2014 from customer-requested construction.
[5] Includes Ameren Illinois' one-time $7.5 million contribution to the Illinois Science and Energy Innovation Trust pursuant to the IEIMA as a result of Ameren Illinois' participation in the electric delivery formula ratemaking process.