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Other Income and Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Component Of Other Income [Line Items] |  |  |
Total other income | $ 105 | $ 149 | $ 100
Net impact of Eletropaulo swap liability gain after tax and noncontrolling interests |  |  | 9
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense | 93 | 153 | 232
Gains Losses On Extinguishment Of Debt | (7) | (62) | (34)
Loss On Sale And Disposal Of Assets [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense | 64 | 68 | 84
Loss On Extinguishment Of Debt [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense | 8 | 62 | 37
Other Member |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense | 21 | 23 | 17
Gas Settlement [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense | 0 | 0 | 72
Transaction Costs Written Off [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense | 0 | 0 | 22
Parent Company | Retirement Of Senior Notes [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  |  | 15
Gener Subsidiary [Member] | Loss On Extinguishment Of Debt [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  | 36 |
Gener Subsidiary [Member] | Gas Settlement [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  |  | 72
Andres And Itabo [Member] | Loss On Extinguishment Of Debt [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  |  | 18
IPL Subsidiary [Member] | Retirement Of Senior Notes [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  | 15 |
Eletropaulo and TermoAndes [Member] | Loss On Sale And Disposal Of Assets [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  | 68 |
Eletropualo, Panama, and Gener [Member] | Loss On Sale And Disposal Of Assets [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  |  | 84
Wind Generation Business [Member] | Transaction Costs Written Off [Member] |  |  |
Component Of Operating Other Cost And Expense [Line Items] |  |  |
Total other expense |  |  | 22
Tax Credit Settlement [Member] |  |  |
Component Of Other Income [Line Items] |  |  |
Total other income | 0 | 31 | 0
Extinguishment Of Liability [Member] | Brazilian Subsidiaries [Member] |  |  |
Component Of Other Income [Line Items] |  |  |
Total other income |  |  | 62
Gain on sale of assets |  |  |
Component Of Other Income [Line Items] |  |  |
Total other income | 21 | 47 | 12
Insurance Proceeds [Member] |  |  |
Component Of Other Income [Line Items] |  |  |
Total other income | 40 | 11 | 1
Other Income Other [Member] |  |  |
Component Of Other Income [Line Items] |  |  |
Total other income | 44 | 46 | 25
Gain On Extinguishment Of Tax And Other Liabilities [Member] |  |  |
Component Of Other Income [Line Items] |  |  |
Total other income | $ 0 | $ 14 | $ 62

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- Definition Other income from a gain recognized on the extinguishment of swap liabilities in Brazil after tax and noncontrolling interests. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition This element represents a sum total of expenses not separately reflected on the income statement for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4,6) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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