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Fair Value (Nonrecurring Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013
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Discounted Cash Flow [Member] | Long Lived Assets Held And Used [Member] | Beaver Valley [Member] |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |
Weighted Average Cost Of Capital Input | 7.00%
Discounted Cash Flow [Member] | Minimum | Long Lived Assets Held And Used [Member] | Beaver Valley [Member] |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |
Annual Revenue Growth Input | 3.00%
Pretax Operating Margin Input | (42.00%)
Discounted Cash Flow [Member] | Maximum | Long Lived Assets Held And Used [Member] | Beaver Valley [Member] |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |
Annual Revenue Growth Input | 45.00%
Pretax Operating Margin Input | 41.00%
Discounted Cash Flow [Member] | Weighted Average | Long Lived Assets Held And Used [Member] | Beaver Valley [Member] |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |
Annual Revenue Growth Input | 19.00%
Pretax Operating Margin Input | 25.00%
Market Approach [Member] | Minimum | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |
Indicative offer prices | 12
Market Approach [Member] | Maximum | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |
Indicative offer prices | 38
Market Approach [Member] | Weighted Average | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |
Indicative offer prices | 25

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- Definition Annual revenue growth used in forecasting cash flows. + References No definition available. + Details
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Period Type: | instant

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- Details
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- Definition Indicative Offer Prices + References No definition available. + Details
Name: | aes_IndicativeOfferPrices
Namespace Prefix: | aes_
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Balance Type: | na
Period Type: | instant

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- Definition Pretax operating margin used in projecting cash flows. + References No definition available. + Details
Name: | aes_PretaxOperatingMarginInput
Namespace Prefix: | aes_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Discount rate used in valuation. + References No definition available. + Details
Name: | aes_WeightedAverageCostOfCapitalInput
Namespace Prefix: | aes_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant