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Commitments (Long-Term Purchase Commitments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Electricity Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | $ 747 | $ 420 | $ 545
Future Commitments 2018 | 581 |  |
Future Commitments 2019 | 508 |  |
Future Commitments 2020 | 440 |  |
Future Commitments 2021 | 469 |  |
Future Commitments 2022 | 438 |  |
Future Commitments Thereafter | 2,065 |  |
Future Commitments Total | 4,501 |  |
Fuel Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,619 | 1,790 | 1,262
Future Commitments 2018 | 1,759 |  |
Future Commitments 2019 | 1,051 |  |
Future Commitments 2020 | 591 |  |
Future Commitments 2021 | 538 |  |
Future Commitments 2022 | 454 |  |
Future Commitments Thereafter | 1,466 |  |
Future Commitments Total | 5,859 |  |
Other Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,945 | $ 817 | $ 1,833
Future Commitments 2018 | 1,488 |  |
Future Commitments 2019 | 931 |  |
Future Commitments 2020 | 470 |  |
Future Commitments 2021 | 234 |  |
Future Commitments 2022 | 547 |  |
Future Commitments Thereafter | 1,314 |  |
Future Commitments Total | $ 4,984 |  |

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
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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