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Regulatory Assets and Liabilities Regulatory Assets and Liabilities - by Reportable Segment (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | $ 1,509 us-gaap_RegulatoryAssets | $ 918 us-gaap_RegulatoryAssets
Regulatory Liabilities | 2,114 us-gaap_RegulatoryLiabilities | 2,053 us-gaap_RegulatoryLiabilities
Brazil SBU |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | 787 us-gaap_RegulatoryAssets / us-gaap_StatementBusinessSegmentsAxis = aes_BrazilGenerationMember | 260 us-gaap_RegulatoryAssets / us-gaap_StatementBusinessSegmentsAxis = aes_BrazilGenerationMember
Regulatory Liabilities | 1,347 us-gaap_RegulatoryLiabilities / us-gaap_StatementBusinessSegmentsAxis = aes_BrazilGenerationMember | 1,336 us-gaap_RegulatoryLiabilities / us-gaap_StatementBusinessSegmentsAxis = aes_BrazilGenerationMember
US SBU |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | 631 us-gaap_RegulatoryAssets / us-gaap_StatementBusinessSegmentsAxis = aes_UsGenerationMember | 550 us-gaap_RegulatoryAssets / us-gaap_StatementBusinessSegmentsAxis = aes_UsGenerationMember
Regulatory Liabilities | 767 us-gaap_RegulatoryLiabilities / us-gaap_StatementBusinessSegmentsAxis = aes_UsGenerationMember | 717 us-gaap_RegulatoryLiabilities / us-gaap_StatementBusinessSegmentsAxis = aes_UsGenerationMember
MCAC SBU (El Salvador) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | 91 us-gaap_RegulatoryAssets / us-gaap_StatementBusinessSegmentsAxis = aes_McacGenerationMember | 108 us-gaap_RegulatoryAssets / us-gaap_StatementBusinessSegmentsAxis = aes_McacGenerationMember
Regulatory Liabilities | $ 0 us-gaap_RegulatoryLiabilities / us-gaap_StatementBusinessSegmentsAxis = aes_McacGenerationMember | $ 0 us-gaap_RegulatoryLiabilities / us-gaap_StatementBusinessSegmentsAxis = aes_McacGenerationMember

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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://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
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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://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
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