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Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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Jun. 30, 2012
Derivative Instruments And Hedging Activities Tables [Abstract] |
Interest Rate Derivatives By Type Table |
|  |  | June 30, 2012
|  |  | Current |  | Maximum(1) |  |  |  |
|  |  |  |  | Derivative |  |  |  | Derivative |  | Weighted |  | % of Debt
|  |  |  |  | Notional |  |  |  | Notional |  | Average |  | Currently
|  |  | Derivative |  | Translated |  | Derivative |  | Translated |  | Remaining |  | Hedged
Interest Rate Derivatives |  | Notional |  | to USD |  | Notional |  | to USD |  | Term(1) |  | by Index(2)
|  |  | (in millions) |  | (in years) |  |
Libor (U.S. Dollar) |  | 3,604 |  | $ | 3,604 |  | 4,608 |  | $ | 4,608 |  | 10 |  | 69%
Euribor (Euro) |  | 626 |  |  | 793 |  | 629 |  |  | 796 |  | 10 |  | 63%
Libor (British Pound) |  | 60 |  |  | 94 |  | 101 |  |  | 158 |  | 14 |  | 91%
Cross Currency Derivatives By Type Table |
|  |  | June 30, 2012
|  |  |  |  |  |  | Weighted |  | % of Debt
|  |  |  |  | Notional |  | Average |  | Currently
|  |  |  |  | Translated |  | Remaining |  | Hedged
Cross Currency Swaps |  | Notional |  | to USD |  | Term(1) |  | by Index(2)
|  |  | (in millions) |  | (in years) |  |
Chilean Unidad de Fomento (CLF) |  | 6 |  | $ | 253 |  | 14 |  | 85%
Foreign Currency Options By Type Table |
|  |  | June 30, 2012
|  |  |  |  |  |  |  |  |  |  | Weighted
|  |  |  |  | Notional |  | Probability |  | Average
|  |  |  |  | Translated |  | Adjusted |  | Remaining
Foreign Currency Options |  | Notional |  | to USD(1) |  | Notional(2) |  | Term(3)
|  |  | (in millions) |  | (in years)
Euro (EUR) |  | 68 |  | $ | 87 |  | $ | 56 |  | <1
Philippine Peso (PHP) |  | 1,625 |  |  | 38 |  |  | 15 |  | <1
British Pound (GBP) |  | 2 |  |  | 3 |  |  | 2 |  | <1
Foreign Currency Forwards By Type Table |
|  |  | June 30, 2012
|  |  |  |  | Notional |  |  | Weighted Average
Foreign Currency Forwards |  | Notional |  | Translated to USD |  |  | Remaining Term(1)
|  |  | (in millions) |  |  | (in years)
Euro (EUR) |  | 95 |  | $ | 131 |  |  | 2
Chilean Peso (CLP) |  | 60,833 |  |  | 122 |  |  | <1
Colombian Peso (COP) |  | 189,847 |  |  | 105 |  |  | <1
Philippine Peso (PHP) |  | 2,183 |  |  | 51 |  |  | <1
British Pound (GBP) |  | 24 |  |  | 37 |  |  | <1
Argentine Peso (ARS) |  | 31 |  |  | 7 |  |  | <1
Embedded Foreign Currency Derivatives By Type Table |
|  |  | June 30, 2012
|  |  |  |  | Notional |  |  | Weighted Average
Embedded Foreign Currency Derivatives |  | Notional |  | Translated to USD |  |  | Remaining Term(1)
|  |  | (in millions) |  |  | (in years)
Philippine Peso (PHP)(2) |  | 64,870 |  | $ | 1,553 |  |  | 11
Argentine Peso (ARS) |  | 943 |  |  | 208 |  |  | 12
Kazakhstani Tenge (KZT) |  | 1,275 |  |  | 9 |  |  | 4
Euro (EUR) |  | 2 |  |  | 3 |  |  | 9
Commodity Non Hedge Derivatives By Type Table |
|  |  | June 30, 2012 |
|  |  |  |  | Weighted Average |
| Commodity Derivatives |  | Notional |  | Remaining Term(1) |
|  |  | (in millions) |  | (in years) |
| Natural gas (MMBTU) |  | 30 |  | 11 |
| Aluminum (MWh) |  | 15(2) |  | 8 |
| Petcoke (Metric tons) |  | 12 |  | 12 |
| Coal (Metric tons) |  | 2 |  | 1 |
| Power (Mwh) |  | 3 |  | 3 |
| Heating Oil (Gallons) |  | 1 |  | <1 |
Fair Value Hierarchy Derivative Assets Liabilities By Balance Sheet Classification Table |
|  |  |  |  | June 30, 2012 |  | December 31, 2011
|  |  |  |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  |  |  | (in millions) |  | (in millions)
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Foreign currency derivatives |  | $ | - |  | $ | 9 |  | $ | 5 |  | $ | 14 |  | $ | - |  | $ | 24 |  | $ | 4 |  | $ | 28
| Commodity and other derivatives |  |  | - |  |  | 19 |  |  | 8 |  |  | 27 |  |  | 2 |  |  | 16 |  |  | 3 |  |  | 21
|  | Total current assets |  |  | - |  |  | 28 |  |  | 13 |  |  | 41 |  |  | 2 |  |  | 40 |  |  | 7 |  |  | 49
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest rate derivatives |  |  | - |  |  | 2 |  |  | - |  |  | 2 |  |  | - |  |  | - |  |  | - |  |  | -
| Cross currency derivatives |  |  | - |  |  | 4 |  |  | - |  |  | 4 |  |  | - |  |  | - |  |  | 1 |  |  | 1
| Foreign currency derivatives |  |  | - |  |  | 6 |  |  | 50 |  |  | 56 |  |  | - |  |  | 3 |  |  | 58 |  |  | 61
| Commodity and other derivatives |  |  | - |  |  | 5 |  |  | 8 |  |  | 13 |  |  | - |  |  | 9 |  |  | - |  |  | 9
|  | Total noncurrent assets |  |  | - |  |  | 17 |  |  | 58 |  |  | 75 |  |  | - |  |  | 12 |  |  | 59 |  |  | 71
|  |  | Total assets |  | $ | - |  | $ | 45 |  | $ | 71 |  | $ | 116 |  | $ | 2 |  | $ | 52 |  | $ | 66 |  | $ | 120
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest rate derivatives |  | $ | - |  | $ | 78 |  | $ | 44 |  | $ | 122 |  | $ | - |  | $ | 97 |  | $ | 22 |  | $ | 119
| Cross currency derivatives |  |  | - |  |  | 6 |  |  | - |  |  | 6 |  |  | - |  |  | - |  |  | 5 |  |  | 5
| Foreign currency derivatives |  |  | - |  |  | 4 |  |  | 1 |  |  | 5 |  |  | - |  |  | 5 |  |  | 1 |  |  | 6
| Commodity and other derivatives |  |  | - |  |  | 20 |  |  | 7 |  |  | 27 |  |  | - |  |  | 17 |  |  | 6 |  |  | 23
|  | Total current liabilities |  |  | - |  |  | 108 |  |  | 52 |  |  | 160 |  |  | - |  |  | 119 |  |  | 34 |  |  | 153
Noncurrent liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest rate derivatives |  |  | - |  |  | 250 |  |  | 237 |  |  | 487 |  |  | - |  |  | 334 |  |  | 106 |  |  | 440
| Cross currency derivatives |  |  | - |  |  | 4 |  |  | - |  |  | 4 |  |  | - |  |  | - |  |  | 14 |  |  | 14
| Foreign currency derivatives |  |  | - |  |  | 76 |  |  | 7 |  |  | 83 |  |  | - |  |  | 10 |  |  | 10 |  |  | 20
| Commodity and other derivatives |  |  | - |  |  | 10 |  |  | 61 |  |  | 71 |  |  | - |  |  | 13 |  |  | 50 |  |  | 63
|  | Total noncurrent liabilities |  |  | - |  |  | 340 |  |  | 305 |  |  | 645 |  |  | - |  |  | 357 |  |  | 180 |  |  | 537
|  |  | Total liabilities |  | $ | - |  | $ | 448 |  | $ | 357 |  | $ | 805 |  | $ | - |  | $ | 476 |  | $ | 214 |  | $ | 690
Derivative Assets Liabilities At Fair Value Net By Balance Sheet Classification And Type Table |
|  |  |  | June 30, 2012 |  | December 31, 2011
|  |  |  |  |  | Not |  |  |  |  |  | Not |  |
|  |  |  | Designated |  | Designated |  |  |  | Designated |  | Designated |  |
|  |  |  | as Hedging |  | as Hedging |  |  |  | as Hedging |  | as Hedging |  |
|  |  |  | Instruments |  | Instruments |  | Total |  | Instruments |  | Instruments |  | Total
|  |  |  | (in millions) |  | (in millions)
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Foreign currency derivatives |  | $ | 6 |  | $ | 8 |  | $ | 14 |  | $ | 10 |  | $ | 18 |  | $ | 28
| Commodity and other derivatives |  |  | 2 |  |  | 25 |  |  | 27 |  |  | 2 |  |  | 19 |  |  | 21
| Total current assets |  |  | 8 |  |  | 33 |  |  | 41 |  |  | 12 |  |  | 37 |  |  | 49
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest rate derivatives |  |  | - |  |  | 2 |  |  | 2 |  |  | - |  |  | - |  |  | -
| Cross currency derivatives |  |  | 4 |  |  | - |  |  | 4 |  |  | 1 |  |  | - |  |  | 1
| Foreign currency derivatives |  |  | 6 |  |  | 50 |  |  | 56 |  |  | 3 |  |  | 58 |  |  | 61
| Commodity and other derivatives |  |  | 1 |  |  | 12 |  |  | 13 |  |  | - |  |  | 9 |  |  | 9
| Total noncurrent assets |  |  | 11 |  |  | 64 |  |  | 75 |  |  | 4 |  |  | 67 |  |  | 71
Total assets |  | $ | 19 |  | $ | 97 |  | $ | 116 |  | $ | 16 |  | $ | 104 |  | $ | 120
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest rate derivatives |  | $ | 114 |  | $ | 8 |  | $ | 122 |  | $ | 110 |  | $ | 9 |  | $ | 119
| Cross currency derivatives |  |  | 6 |  |  | - |  |  | 6 |  |  | 5 |  |  | - |  |  | 5
| Foreign currency derivatives |  |  | 3 |  |  | 2 |  |  | 5 |  |  | 1 |  |  | 5 |  |  | 6
| Commodity and other derivatives |  |  | 3 |  |  | 24 |  |  | 27 |  |  | - |  |  | 23 |  |  | 23
| Total current liabilities |  |  | 126 |  |  | 34 |  |  | 160 |  |  | 116 |  |  | 37 |  |  | 153
Noncurrent liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest rate derivatives |  |  | 473 |  |  | 14 |  |  | 487 |  |  | 425 |  |  | 15 |  |  | 440
| Cross currency derivatives |  |  | 4 |  |  | - |  |  | 4 |  |  | 14 |  |  | - |  |  | 14
| Foreign currency derivatives |  |  | - |  |  | 83 |  |  | 83 |  |  | - |  |  | 20 |  |  | 20
| Commodity and other derivatives |  |  | 4 |  |  | 67 |  |  | 71 |  |  | 3 |  |  | 60 |  |  | 63
| Total noncurrent liabilities |  |  | 481 |  |  | 164 |  |  | 645 |  |  | 442 |  |  | 95 |  |  | 537
Total liabilities |  | $ | 607 |  | $ | 198 |  | $ | 805 |  | $ | 558 |  | $ | 132 |  | $ | 690
Accumulated Other Comprehensive Income Loss Derivatives Table |
| Interest rate derivatives |  | $ | (114) |
| Cross currency derivatives |  | $ | 4 |
| Foreign currency derivatives |  | $ | 2 |
| Commodity and other derivatives |  | $ | (1) |
Gain Loss In Accumulated Other Comprehensive Income And Earnings On Effective Portion Of Qualifying Cash Flow Hedges Table |
|  |  | Gains (Losses) |  |  |  | Gains (Losses) Reclassified
|  |  | Recognized in AOCL |  |  |  | from AOCL into Earnings
|  |  | Three Months |  | Classification in |  | Three Months
|  |  | Ended June 30, |  | Condensed Consolidated |  | Ended June 30,
|  |  | 2012 |  | 2011 |  | Statements of Operations |  | 2012 |  | 2011
|  |  | (in millions) |  |  |  |  | (in millions)
Interest rate derivatives |  | $ | (153) |  | $ | (144) |  | Interest expense |  | $ | (30) |  | $ | (27)
|  |  |  |  |  |  |  |  | Non-regulated cost of sales |  |  | (1) |  |  | (1)
|  |  |  |  |  |  |  |  | Net equity in earnings of |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | affiliates |  |  | (1) |  |  | (1)
|  |  |  |  |  |  |  |  | Gain on sale of investments |  |  | (4) |  |  | -
Cross currency derivatives |  |  | (9) |  |  | 11 |  | Interest expense |  |  | (3) |  |  | 7
|  |  |  |  |  |  |  |  | Foreign currency transaction |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | gains (losses) |  |  | (6) |  |  | 10
Foreign currency derivatives |  |  | 6 |  |  | (7) |  | Foreign currency transaction |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | gains (losses) |  |  | - |  |  | (2)
Commodity and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| derivatives |  |  | (1) |  |  | (1) |  | Non-regulated revenue |  |  | - |  |  | -
Total |  | $ | (157) |  | $ | (141) |  |  |  |  | $ | (45) |  | $ | (14)
|  |  | Gains (Losses) |  |  |  |  | Gains (Losses) Reclassified
|  |  | Recognized in AOCL |  |  |  | from AOCL into Earnings(1)
|  |  | Six Months |  | Classification in |  | Six Months
|  |  | Ended June 30, |  | Condensed Consolidated |  | Ended June 30,
|  |  | 2012 |  | 2011 |  | Statements of Operations |  | 2012 |  | 2011
|  |  | (in millions) |  |  |  |  | (in millions)
Interest rate derivatives |  | $ | (142) |  | $ | (92) |  | Interest expense |  | $ | (62) |  | $ | (53)
|  |  |  |  |  |  |  |  | Non-regulated cost of sales |  |  | (3) |  |  | (2)
|  |  |  |  |  |  |  |  | Net equity in earnings of |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | affiliates |  |  | (2) |  |  | (2)
|  |  |  |  |  |  |  |  | Gain on sale of investments |  |  | (96) |  |  | -
Cross currency derivatives |  |  | 5 |  |  | 3 |  | Interest expense |  |  | (6) |  |  | 2
|  |  |  |  |  |  |  |  | Foreign currency transaction |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | gains (losses) |  |  | 12 |  |  | 5
Foreign currency derivatives |  |  | 12 |  |  | (2) |  | Foreign currency transaction |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | gains (losses) |  |  | - |  |  | (4)
Commodity and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| derivatives |  |  | (7) |  |  | - |  | Non-regulated revenue |  |  | (2) |  |  | -
Total |  | $ | (132) |  | $ | (91) |  |  |  |  | $ | (159) |  | $ | (54)
Gain Loss In Earnings On Ineffective Portion Of Qualifying Cash Flow Hedges Table |
|  |  |  |  |  | Gains (Losses) |  | Gains (Losses)
|  |  |  |  |  | Recognized in Earnings |  | Recognized in Earnings
|  |  | Classification in Condensed |  | Three Months Ended |  | Six Months Ended
|  |  | Consolidated Statements |  | June 30, |  | June 30,
|  |  | of Operations |  | 2012 |  | 2011 |  | 2012 |  | 2011
|  |  |  |  |  | (in millions) |  | (in millions)
Interest rate derivatives |  | Interest expense |  | $ | 2 |  | $ | -(1) |  | $ | 1 |  | $ | (7)
|  |  | Net equity in earnings of affiliates |  |  | (1) |  |  | (1) |  |  | (1) |  |  | (1)
Cross currency derivatives |  | Interest expense |  |  | - (1) |  |  | (2) |  |  | - (1) |  |  | (2)
Foreign currency derivatives |  | Foreign currency transaction gains (losses) |  |  | - (1) |  |  | -(1) |  |  | - (1) |  |  | -(1)
Commodity derivatives - electricity |  | Non-regulated revenue |  |  | - (1) |  |  | -(1) |  |  | - (1) |  |  | -(1)
Total |  |  |  |  | $ | 1 |  | $ | (3) |  | $ | - |  | $ | (10)
Gain Loss In Earnings On Non Hedging Instruments Table |
|  |  |  |  |  | Gains (Losses) |  | Gains (Losses)
|  |  |  |  |  | Recognized in Earnings |  | Recognized in Earnings
|  |  | Classification |  | Three Months Ended |  | Six Months Ended
|  |  | in Condensed Consolidated |  | June 30, |  | June 30,
|  |  | Statements of Operations |  | 2012 |  | 2011 |  | 2012 |  | 2011
|  |  |  |  |  | (in millions)
Interest rate derivatives |  | Interest expense |  | $ | (1) |  | $ | (1) |  | $ | (3) |  | $ | (1)
Foreign currency derivatives |  | Foreign currency transaction gains |  |  | (38) |  |  | 20 |  |  | (76) |  |  | 27
Commodity and other derivatives |  | Non-regulated revenue |  |  | (13) |  |  | (13) |  |  | 1 |  |  | (9)
|  |  | Regulated revenue |  |  | (3) |  |  | - |  |  | 1 |  |  | -
|  |  | Non-regulated cost of sales |  |  | - |  |  | (2) |  |  | 3 |  |  | (1)
|  |  | Regulated cost of sales |  |  | (5) |  |  | - |  |  | (17) |  |  | -
Total |  |  |  |  | $ | (60) |  | $ | 4 |  | $ | (91) |  | $ | 16
Regulatory Asset Liability Change In Fair Value Of Derivatives |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
|  | (in millions)
(Increase) decrease in regulatory assets |  | $ | (8) |  | $ | (2) |  | $ | (5) |  | $ | (2)
Increase (decrease) in regulatory liabilities |  | $ | (1) |  | $ | 7 |  | $ | (1) |  | $ | 6

X
- Definition The element represents a table which sets forth, by type of derivative instrument, the pre-tax accumulated other comprehensive income (loss) expected to be recognized as an increase (decrease) to income from continuing operations before income taxes over the next twelve months as of the balance sheet date. + References No definition available. + Details
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- Definition This element represents a table which sets forth, by type of commodity, the outstanding notionals and weighted average remaining terms of the commodity derivatives (excluding Eastern Energy, which is presented separately) and embedded derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition This element represents a table which sets forth, by type of foreign currency denomination, the current outstanding notional, weighted average remaining term and percentage of variable-rate debt hedged at the balance sheet date, all of which are in qualifying cash flow hedging relationships. + References No definition available. + Details
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- Definition This element represents a table which sets forth the fair value and balance sheet classification of derivative instruments at the balance sheet date separately for derivative instruments designated as hedging instruments and derivative instruments not designated as hedging instruments. + References No definition available. + Details
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- Details
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- Definition This element represents a table which sets forth, by type of foreign currency denomination, the outstanding notionals over the remaining terms of its foreign currency embedded derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition This element represents a table which sets forth, by type of foreign currency denomination, the outstanding notionals over the remaining terms of the foreign currency forward derivative instruments at the balance sheet date, regardless of whether the derivative instruments are in qualifying hedging relationships. + References No definition available. + Details
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- Definition This element represents a table which sets for, by type of foreign currency denomination, the outstanding notionals over the remaining terms of the foreign currency option derivative instruments at the balance sheet date, regardless of whether the derivative instruments are in qualifying hedging relationships. + References No definition available. + Details
Name: | aes_ForeignCurrencyOptionsByTypeTextBlock
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- Definition This element represents tables which set forth, by type of derivative instrument, the gains (losses) recognized in accumulated other comprehensive income (loss) and earnings and the income statement classification related to the effective portion of derivative instruments in qualifying cash flow hedging relationships for the periods indicated. + References No definition available. + Details
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- Definition This element represents tables which set forth, by type of derivative instrument, the gains (losses) recognized in earnings and the income statement classification related to the ineffective portion of derivative instruments in qualifying cash flow hedging relationships for the periods indicated. + References No definition available. + Details
Name: | aes_GainLossInEarningsOnIneffectivePortionOfQualifyingCashFlowHedgesTextBlock
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- Definition This element represents tables which set forth, by type of derivative instrument, the gains (losses) recognized in earnings and the income statement classification related to derivative instruments not designated as hedging instruments for the periods indicated. + References No definition available. + Details
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- Definition This element represents a table which sets forth, by type of interest rate derivative, the current and maximum outstanding notional, weighted average remaining term and percentage of variable-rate debt hedged at the balance sheet date, regardless of whether the derivative instruments are in qualifying cash flow hedging relationships. + References No definition available. + Details
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Period Type: | duration

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- Definition The element represents a table which sets forth the increase (decrease) in regulatory assets and liabilities resulting from the change in fair value of derivative instruments. + References No definition available. + Details
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Namespace Prefix: | aes_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -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. + Details
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration