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Commitments (Long-Term Purchase Commitments) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Electricity Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | $ 3,104 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember | $ 2,665 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember | $ 2,819 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember
Future Commitments 2015 | 3,559 aes_LongTermPurchaseCommitmentWithinOneYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember |  |
Future Commitments 2016 | 3,660 aes_LongTermPurchaseCommitmentWithinTwoYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember |  |
Future Commitments 2017 | 3,217 aes_LongTermPurchaseCommitmentWithinThreeYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember |  |
Future Commitments 2018 | 3,335 aes_LongTermPurchaseCommitmentWithinFourYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember |  |
Future Commitments 2019 | 3,521 aes_LongTermPurchaseCommitmentWithinFiveYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember |  |
Future Commitments Thereafter | 34,805 aes_LongTermPurchaseCommitmentThereafter / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember |  |
Future Commitments Total | 52,097 aes_LongTermPurchaseCommitment / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_ElectricityPurchaseContractsMember |  |
Fuel Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,521 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember | 1,590 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember | 1,832 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember
Future Commitments 2015 | 1,266 aes_LongTermPurchaseCommitmentWithinOneYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember |  |
Future Commitments 2016 | 819 aes_LongTermPurchaseCommitmentWithinTwoYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember |  |
Future Commitments 2017 | 761 aes_LongTermPurchaseCommitmentWithinThreeYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember |  |
Future Commitments 2018 | 502 aes_LongTermPurchaseCommitmentWithinFourYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember |  |
Future Commitments 2019 | 356 aes_LongTermPurchaseCommitmentWithinFiveYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember |  |
Future Commitments Thereafter | 3,235 aes_LongTermPurchaseCommitmentThereafter / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember |  |
Future Commitments Total | 6,939 aes_LongTermPurchaseCommitment / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_FuelPurchaseContractsMember |  |
Other Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,386 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember | 1,743 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember | 1,637 aes_LongTermPurchaseCommitmentAmountActual / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember
Future Commitments 2015 | 1,377 aes_LongTermPurchaseCommitmentWithinOneYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember |  |
Future Commitments 2016 | 930 aes_LongTermPurchaseCommitmentWithinTwoYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember |  |
Future Commitments 2017 | 898 aes_LongTermPurchaseCommitmentWithinThreeYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember |  |
Future Commitments 2018 | 707 aes_LongTermPurchaseCommitmentWithinFourYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember |  |
Future Commitments 2019 | 614 aes_LongTermPurchaseCommitmentWithinFiveYears / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember |  |
Future Commitments Thereafter | 4,874 aes_LongTermPurchaseCommitmentThereafter / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember |  |
Future Commitments Total | $ 9,400 aes_LongTermPurchaseCommitment / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = aes_OtherPurchaseContractsMember |  |

X
- Definition The total minimum amount the entity agreed to spend under the long-term purchase commitment + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitment
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The actual amount the entity purchased under the long-term purchase commitment + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitmentAmountActual
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment, which payments are due after the fifth year following the balance sheet date + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitmentThereafter
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment, which payments are due in the Fifth year following the balance sheet date + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitmentWithinFiveYears
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment, which payments are due in the fourth year following the balance sheet date + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitmentWithinFourYears
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment, which payments are due within one year of the balance sheet date + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitmentWithinOneYear
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment, which payments are due in the third year following the balance sheet date + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitmentWithinThreeYears
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment, which payments are due in the second year following the balance sheet date + References No definition available. + Details
Name: | aes_LongTermPurchaseCommitmentWithinTwoYears
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=aes_ElectricityPurchaseContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=aes_FuelPurchaseContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=aes_OtherPurchaseContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |