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Derivative Instruments and Hedging Activities (Details) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2012 USD ($) | Mar. 31, 2011 USD ($) | Dec. 31, 2011 USD ($) | Mar. 31, 2012 Gener Subsidiary [Member] USD ($) | Dec. 31, 2011 Gener Subsidiary [Member] USD ($) | Mar. 31, 2012 DPL Subsidiary [Member] USD ($) | Dec. 31, 2011 DPL Subsidiary [Member] USD ($) | Mar. 31, 2012 Interest Rate Derivatives USD ($) | Mar. 31, 2011 Interest Rate Derivatives USD ($) | Mar. 31, 2012 Interest Rate Derivatives Interest expense USD ($) | Mar. 31, 2011 Interest Rate Derivatives Interest expense USD ($) | Mar. 31, 2012 Interest Rate Derivatives Non-regulated cost of sales USD ($) | Mar. 31, 2011 Interest Rate Derivatives Non-regulated cost of sales USD ($) | Mar. 31, 2012 Interest Rate Derivatives Net equity in earnings of affiliates USD ($) | Mar. 31, 2011 Interest Rate Derivatives Net equity in earnings of affiliates USD ($) | Mar. 31, 2012 Interest Rate Derivatives Gain on sale of investments [Member] USD ($) | Mar. 31, 2011 Interest Rate Derivatives Gain on sale of investments [Member] USD ($) | Mar. 31, 2012 Cross Currency Swaps USD ($) | Mar. 31, 2011 Cross Currency Swaps USD ($) | Mar. 31, 2012 Cross Currency Swaps Interest expense USD ($) | Mar. 31, 2011 Cross Currency Swaps Interest expense USD ($) | Mar. 31, 2012 Cross Currency Swaps Foreign currency transaction gains (losses) [Member] USD ($) | Mar. 31, 2011 Cross Currency Swaps Foreign currency transaction gains (losses) [Member] USD ($) | Mar. 31, 2012 Foreign Currency USD ($) | Mar. 31, 2011 Foreign Currency USD ($) | Mar. 31, 2012 Foreign Currency Foreign currency transaction gains (losses) [Member] USD ($) | Mar. 31, 2011 Foreign Currency Foreign currency transaction gains (losses) [Member] USD ($) | Mar. 31, 2012 Commodity & Other USD ($) | Mar. 31, 2011 Commodity & Other USD ($) | Mar. 31, 2012 Commodity & Other Non-regulated revenue USD ($) | Mar. 31, 2011 Commodity & Other Non-regulated revenue USD ($) | Mar. 31, 2012 Commodity & Other Non-regulated cost of sales USD ($) | Mar. 31, 2011 Commodity & Other Non-regulated cost of sales USD ($) | Mar. 31, 2012 Commodity & Other Regulated revenue USD ($) | Mar. 31, 2011 Commodity & Other Regulated revenue USD ($) | Mar. 31, 2012 Commodity & Other Regulated cost of sales USD ($) | Mar. 31, 2011 Commodity & Other Regulated cost of sales USD ($) | Mar. 31, 2012 Designated as Hedging Instruments USD ($) | Dec. 31, 2011 Designated as Hedging Instruments USD ($) | Mar. 31, 2012 Not Designated as Hedging Instruments USD ($) | Dec. 31, 2011 Not Designated as Hedging Instruments USD ($) | Mar. 31, 2012 Level 1 USD ($) | Dec. 31, 2011 Level 1 USD ($) | Mar. 31, 2012 Level 2 USD ($) | Dec. 31, 2011 Level 2 USD ($) | Mar. 31, 2012 Level 3 USD ($) | Dec. 31, 2011 Level 3 USD ($) | Mar. 31, 2012 Interest Rate Derivatives Libor USD [Member] | Mar. 31, 2012 Interest Rate Derivatives Euribor EUR [Member] | Mar. 31, 2012 Interest Rate Derivatives Libor GBP [Member] | Mar. 31, 2012 Interest Rate Derivatives Current [Member] Libor USD [Member] USD ($) | Mar. 31, 2012 Interest Rate Derivatives Current [Member] Euribor EUR [Member] USD ($) | Mar. 31, 2012 Interest Rate Derivatives Current [Member] Euribor EUR [Member] EUR (€) | Mar. 31, 2012 Interest Rate Derivatives Current [Member] Libor GBP [Member] USD ($) | Mar. 31, 2012 Interest Rate Derivatives Current [Member] Libor GBP [Member] GBP (£) | Mar. 31, 2012 Interest Rate Derivatives Maximum [Member] Libor USD [Member] USD ($) | Mar. 31, 2012 Interest Rate Derivatives Maximum [Member] Euribor EUR [Member] USD ($) | Mar. 31, 2012 Interest Rate Derivatives Maximum [Member] Euribor EUR [Member] EUR (€) | Mar. 31, 2012 Interest Rate Derivatives Maximum [Member] Libor GBP [Member] USD ($) | Mar. 31, 2012 Interest Rate Derivatives Maximum [Member] Libor GBP [Member] GBP (£) | Mar. 31, 2012 Cross Currency Swaps Chilean Unidad De Fomento CLF [Member] USD ($) | Mar. 31, 2012 Cross Currency Swaps Chilean Unidad De Fomento CLF [Member] CLF | Mar. 31, 2012 Foreign Currency Options Euro EUR [Member] USD ($) | Mar. 31, 2012 Foreign Currency Options Euro EUR [Member] EUR (€) | Mar. 31, 2012 Foreign Currency Options Brazilian Real BRL [Member] USD ($) | Mar. 31, 2012 Foreign Currency Options Brazilian Real BRL [Member] BRL | Mar. 31, 2012 Foreign Currency Options Philippine Peso PHP [Member] USD ($) | Mar. 31, 2012 Foreign Currency Options Philippine Peso PHP [Member] PHP | Mar. 31, 2012 Foreign Currency Options British Pound GBP [Member] USD ($) | Mar. 31, 2012 Foreign Currency Options British Pound GBP [Member] GBP (£) | Mar. 31, 2012 Foreign Currency Options Argentine Peso ARS [Member] USD ($) | Mar. 31, 2012 Foreign Currency Options Argentine Peso ARS [Member] ARS | Mar. 31, 2012 Foreign Currency Forwards Euro EUR [Member] USD ($) | Mar. 31, 2012 Foreign Currency Forwards Euro EUR [Member] EUR (€) | Mar. 31, 2012 Foreign Currency Forwards British Pound GBP [Member] USD ($) | Mar. 31, 2012 Foreign Currency Forwards British Pound GBP [Member] GBP (£) | Mar. 31, 2012 Foreign Currency Forwards Chilean Peso CLP [Member] USD ($) | Mar. 31, 2012 Foreign Currency Forwards Chilean Peso CLP [Member] CLP | Mar. 31, 2012 Foreign Currency Forwards Colombian Peso COP [Member] USD ($) | Mar. 31, 2012 Foreign Currency Forwards Colombian Peso COP [Member] COP | Mar. 31, 2012 Foreign Currency Forwards Argentine Peso ARS [Member] USD ($) | Mar. 31, 2012 Foreign Currency Forwards Argentine Peso ARS [Member] ARS | Mar. 31, 2012 Foreign Currency Forwards Hungarian Forint HUF [Member] USD ($) | Mar. 31, 2012 Foreign Currency Forwards Hungarian Forint HUF [Member] HUF | Mar. 31, 2012 Embedded Foreign Currency Derivatives Euro EUR [Member] USD ($) | Mar. 31, 2012 Embedded Foreign Currency Derivatives Euro EUR [Member] EUR (€) | Mar. 31, 2012 Embedded Foreign Currency Derivatives Philippine Peso PHP [Member] USD ($) | Mar. 31, 2012 Embedded Foreign Currency Derivatives Philippine Peso PHP [Member] PHP | Mar. 31, 2012 Embedded Foreign Currency Derivatives Argentine Peso ARS [Member] USD ($) | Mar. 31, 2012 Embedded Foreign Currency Derivatives Argentine Peso ARS [Member] ARS | Mar. 31, 2012 Embedded Foreign Currency Derivatives Kazakhstani Tenge KZT [Member] USD ($) | Mar. 31, 2012 Embedded Foreign Currency Derivatives Kazakhstani Tenge KZT [Member] KZT | Mar. 31, 2012 Commodity Derivatives Natural Gas MMBTU [Member] MMBTU | Mar. 31, 2012 Commodity Derivatives Petcoke Metric Tons [Member] MetricTons | Mar. 31, 2012 Commodity Derivatives Aluminum M Wh [Member] MWh | Mar. 31, 2012 Commodity Derivatives Heating Oil Gallons [Member] gallon | Mar. 31, 2012 Commodity Derivatives Coal Metric Tons [Member] MetricTons
Derivative Tables [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount Of Interest Rate Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,657 | $ 891 | € 668 | $ 107 | £ 67 | $ 4,668 | $ 891 | € 668 | $ 132 | £ 83 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Remaining Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 | 13 |  |  |  |  |  |  |  |  |  |  | 14 | 14 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | 2 | 2 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | 9 | 9 | 11 | 11 | 11 | 11 | 9 | 9 | 11 | 12 | 8 | <1 | 1
% of Debt Currently Hedged by Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71.00% | 65.00% | 92.00% |  |  |  |  |  |  |  |  |  |  | 85.00% | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount Of Foreign Currency Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 253 |  | 83 | 62 | 63 | 110 | 30 | 1,285 | 2 | 1 | 4 | 18 | 133 | 95 | 29 | 18 | 169 | 84,974 | 77 | 137,722 | 7 | 31 | 1 | 402 | 3 | 2 | 1,247 | 53,591 | 215 | 943 | 196 | 29,023 |  |  |  |  |
Notional (CLF) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability Adjusted Notional |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 |  | 53 |  | 18 |  | 2 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,000,000 | 12,000,000 | 15,000,000 | 2,000,000 | 3,000,000
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency derivatives | 15 |  | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 10 | 10 | 18 | 0 | 0 | 11 | 24 | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity and other derivatives | 20 |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 | 19 | 19 | 2 | 2 | 16 | 16 | 2 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current assets | 35 |  | 49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 12 | 29 | 37 | 2 | 2 | 27 | 40 | 6 | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency derivatives | 55 |  | 61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 3 | 51 | 58 | 0 | 0 | 4 | 3 | 51 | 58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency derivatives | 5 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 1 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity and other derivatives | 14 |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 14 | 9 | 0 | 0 | 5 | 9 | 9 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total noncurrent assets | 74 |  | 71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 4 | 65 | 67 | 0 | 0 | 14 | 12 | 60 | 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 109 |  | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 16 | 94 | 104 | 2 | 2 | 41 | 52 | 66 | 66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 113 |  | 119 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105 | 110 | 8 | 9 | 0 | 0 | 96 | 97 | 17 | 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency derivatives | 4 |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 5 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency derivatives | 9 |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 1 | 4 | 5 | 0 | 0 | 8 | 5 | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity and other derivatives | 31 |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 0 | 30 | 23 | 0 | 0 | 27 | 17 | 4 | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current liabilities | 157 |  | 153 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115 | 116 | 42 | 37 | 0 | 0 | 135 | 119 | 22 | 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 391 |  | 440 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 376 | 425 | 15 | 15 | 0 | 0 | 284 | 334 | 107 | 106 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency derivatives | 1 |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 14 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency derivatives | 34 |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 34 | 20 | 0 | 0 | 27 | 10 | 7 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity and other derivatives | 65 |  | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 3 | 60 | 60 | 0 | 0 | 13 | 13 | 52 | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total noncurrent derivative liabilities | 491 |  | 537 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 382 | 442 | 109 | 95 | 0 | 0 | 325 | 357 | 166 | 180 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities | 648 |  | 690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 497 | 558 | 151 | 132 | 0 | 0 | 460 | 476 | 188 | 214 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI to be recognized in next 12 months table |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  | (99) |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  | (2) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain Loss By Type Of Derivative Tables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) Recognized in AOCL | 25 | 50 |  |  |  |  |  | 11 | 52 |  |  |  |  |  |  |  |  | 14 | (8) |  |  |  |  | 6 | 5 |  |  | (6) | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) Reclassified from AOCL into Earnings | (114) | (40) |  |  |  |  |  |  |  | (32) | (26) | (2) | (1) | (1) | (1) | (92) | 0 |  |  | (3) | (5) | 18 | (5) |  |  | 0 | (2) |  |  | (2) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) Recognized in Earnings (ineffective portion) | (1) | (7) |  |  |  |  |  |  |  | (1) | (7) |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (31) | 12 |  |  |  |  |  |  |  | (2) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (38) | 7 |  |  | 14 | 4 | 3 | 1 | (4) | 0 | (4) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPL Regulatory Activity Narrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Increase) decrease in regulatory assets | 3 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in regulatory liabilities | 0 | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Risk-Related Contingent Features [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net liability position, derivative transactions |  |  |  | 5 | 18 | 38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral posted for cross currency swap derivative transactions | 26 |  | 16 |  |  | 26 | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Collateral Received From Counterparties | $ 2 |  | $ 3 |  |  | $ 2 | $ 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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