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Regulatory Assets and Liabilities Regulatory Assets and Liabilities - by Reportable Segment (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | $ 643 | $ 703
Regulatory Liabilities | $ 1,171 | $ 1,232

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- Definition [Line Items] for Schedule of Regulatory Assets and Liabilities [Table] + References No definition available. + Details
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Namespace Prefix: | aes_
Data Type: | xbrli:stringItemType
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- 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://fasb.org/us-gaap/role/ref/legacyRef -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
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- 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://fasb.org/us-gaap/role/ref/legacyRef -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
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