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Retirement Benefits (Schedule Of Potential Changes In Key Assumptions) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Service Cost and Interest Cost, .25% decrease in discount rate $ (1)aee_DefinedBenefitPlanEffectOfQuarterPercentagePointDecreaseOfDiscountRateOnServiceAndInterestCostComponents
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Benefit Obligation, .25% decrease in discount rate 138aee_DefinedBenefitPlanEffectOfQuarterPercentagePointDecreaseOfDiscountRateOnProjectedBenefitObligation
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Service Cost and Interest Cost, .25% increase in salary rate 2aee_DefinedBenefitPlanEffectOfQuarterPercentagePointIncreaseOfAssumedAnnualSalaryIncreaseRateOnServiceAndInterestCostComponents
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Benefit Obligation, .25% increase in salary rate 13aee_DefinedBenefitPlanEffectOfQuarterPercentagePointIncreaseOfAssumedAnnualSalaryIncreaseRateOnProjectedBenefitObligation
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Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Service Cost and Interest Cost, .25% decrease in discount rate 1aee_DefinedBenefitPlanEffectOfQuarterPercentagePointDecreaseOfDiscountRateOnServiceAndInterestCostComponents
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Benefit Obligation, .25% decrease in discount rate 39aee_DefinedBenefitPlanEffectOfQuarterPercentagePointDecreaseOfDiscountRateOnProjectedBenefitObligation
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Service Cost and Interest Cost, 1.00% increase in annual medical trend 3us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
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Benefit Obligation, 1.00% increase in annual medical trend 36us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
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Service Cost and Interest Cost, 1.00% decrease in annual medical trend (2)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
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Benefit Obligation, 1.00% decrease in annual medical trend $ (33)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
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