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Benefit Plans (Impact of One Point Change in Assumptions) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Defined Benefit Plan Assumptions Sensitivity To Changes [Abstract] |
Increase of 1% in the discount rate | $ (13)
Decrease of 1% in the discount rate | 12
Increase of 1% in the long-term rate of return on plan assets | (15)
Decrease of 1% in the long-term rate of return on plan assets | $ 15

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | aes_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the impact on pension expense that would result from a one percentage point decrease in the discount rate assumptions for defined benefit pension plans + References No definition available. + Details
Name: | aes_DefinedBenefitPlanEffectOfOnePercentDecreaseInDiscountRateOnPensionExpense
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the impact on pension expense that would result from a one percentage point decrease in the long-term rate of return on plan asset assumptions for defined benefit pension plans + References No definition available. + Details
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Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the impact on pension expense that would result from a one percentage point increase in the discount rate assumptions for defined benefit pension plans + References No definition available. + Details
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Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the impact on pension expense that would result from a one percentage point increase in the long-term rate of return on plan asset assumptions for defined benefit pension plans + References No definition available. + Details
Name: | aes_DefinedBenefitPlanEffectOfOnePercentIncreaseInRateOfReturnOnPensionExpense
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration