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Derivative Instruments (Notional Amounts Of Derivative Instruments) (Details) (Commodity [Member])
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Dec. 31, 2012
MWh
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Electricity (MWhs) [Member]
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| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
7,676,000 |
|
Electricity (MWhs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
2,758,000 |
|
Electricity (MWhs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
4,918,000 |
|
FTRs (MWs) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
28,000 |
|
FTRs (MWs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
15,000 |
|
FTRs (MWs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
13,000 |
|
Natural Gas (Dths) [Member]
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| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
80,302,000 |
|
Natural Gas (Dths) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
61,491,000 |
|
Natural Gas (Dths) [Member] | WPL [Member]
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|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
18,811,000 |
|
Coal (Tons) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
2,439,000 |
|
Coal (Tons) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
2,439,000 |
|
2013 [Member] | Electricity (MWhs) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
4,130,000 |
|
2013 [Member] | Electricity (MWhs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
2,209,000 |
|
2013 [Member] | Electricity (MWhs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
1,921,000 |
|
2013 [Member] | FTRs (MWs) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
28,000 |
|
2013 [Member] | FTRs (MWs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
15,000 |
|
2013 [Member] | FTRs (MWs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
13,000 |
|
2013 [Member] | Natural Gas (Dths) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
72,105,000 |
|
2013 [Member] | Natural Gas (Dths) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
57,731,000 |
|
2013 [Member] | Natural Gas (Dths) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
14,374,000 |
|
2013 [Member] | Coal (Tons) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
896,000 |
|
2013 [Member] | Coal (Tons) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
896,000 |
|
2014 [Member] | Electricity (MWhs) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
2,670,000 |
|
2014 [Member] | Electricity (MWhs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
549,000 |
|
2014 [Member] | Electricity (MWhs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
2,121,000 |
|
2014 [Member] | FTRs (MWs) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
0 |
|
2014 [Member] | FTRs (MWs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
0 |
|
2014 [Member] | FTRs (MWs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
0 |
|
2014 [Member] | Natural Gas (Dths) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
7,747,000 |
|
2014 [Member] | Natural Gas (Dths) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
3,535,000 |
|
2014 [Member] | Natural Gas (Dths) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
4,212,000 |
|
2014 [Member] | Coal (Tons) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
981,000 |
|
2014 [Member] | Coal (Tons) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
981,000 |
|
2015 [Member] | Electricity (MWhs) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
876,000 |
|
2015 [Member] | Electricity (MWhs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
0 |
|
2015 [Member] | Electricity (MWhs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
876,000 |
|
2015 [Member] | FTRs (MWs) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
0 |
|
2015 [Member] | FTRs (MWs) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
0 |
|
2015 [Member] | FTRs (MWs) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
0 |
|
2015 [Member] | Natural Gas (Dths) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
450,000 |
|
2015 [Member] | Natural Gas (Dths) [Member] | IPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
225,000 |
|
2015 [Member] | Natural Gas (Dths) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
225,000 |
|
2015 [Member] | Coal (Tons) [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
562,000 |
|
2015 [Member] | Coal (Tons) [Member] | WPL [Member]
|
|
| Notional Amount of Derivatives [Line Items] |
|
| Notional unit amount of derivatives (in MWhs/MWs/Dths/tons) |
562,000 |