XML 141 R103.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | $ 119 | $ 88
Total Non Current Regulatory Assets |  | 542 | 655
TOTAL REGULATORY ASSETS |  | 661 | 743
Total Current Regulatory Liabilities |  | 17 | 41
Total Non Current Regulatory Liabilities |  | 1,079 | 802
TOTAL REGULATORY LIABILITIES |  | 1,096 | 843
Efficiency Program Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 10 | 14
Deferred Income Tax Charge [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Liabilities |  | 243 | 2
Asset Retirement Obligation Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Liabilities |  | 830 | 795
Other Regulatory Liabilities |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 7 | 27
Total Non Current Regulatory Liabilities |  | 6 | 5
El Salvador Tariff Recoveries |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | 59 | 54
Pension Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets | [1] | 298 | 316
Income Taxes Recoverable From Customers |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets | [1] | 0 | 87
Deferred Midwest Independent Service Operator Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets |  | 102 | 114
Environmental Restoration Costs [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets |  | 48 | 41
Other Regulatory Assets |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | 60 | 34
Total Non Current Regulatory Assets |  | $ 94 | $ 97
[1] | Past expenditures on which the Company earns a rate of return.

X
- Definition [Line Items] for Schedule of Regulatory Assets and Liabilities [Table] + References No definition available. + Details
Name: | aes_ScheduleofRegulatoryAssetsandLiabilitiesLineItems
Namespace Prefix: | aes_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RegulatoryLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=aes_EfficiencyProgramCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_AssetRetirementObligationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=aes_OtherRegulatoryLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=aes_ElSalvadorTariffRecoveriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_PensionCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=aes_IncomeTaxesRecoverableFromCustomersMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=aes_DeferredMidwestIndependentServiceOperatorCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_EnvironmentalRestorationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=aes_OtherRegulatoryAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |