v2.4.0.6

Commitments And Contingencies (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |
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Jul. 31, 2012 subclass | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Workforce Subject to Collective Bargaining Arrangements [Member] | Dec. 31, 2012 Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] | Dec. 31, 2012 Defined Benefit Pension Plans [Member] | Dec. 31, 2011 Defined Benefit Pension Plans [Member] | Dec. 31, 2010 Defined Benefit Pension Plans [Member] | Dec. 31, 2012 Clean Air Interstate Rule [Member] MW | Dec. 31, 2012 Utility Maximum Achievable Control Technology [Member] Minimum [Member] MW | Dec. 31, 2012 Wisconsin State Mercury Rule [Member] lb_per_gw_hr | Dec. 31, 2012 Ozone NAAQS Rule [Member] ppm | Dec. 31, 2012 Fine Particle NAAQS Rule [Member] | Dec. 31, 2012 Nitrogen Dioxide NAAQS Rule [Member] ppb | Dec. 31, 2012 SO2 NAAQS Rule [Member] ppb | Dec. 31, 2012 EPA New Source Performance Standards for GHG [Member] lb MW | Dec. 31, 2012 Electric Generating Units Mercury Emission Reduction Percentage [Member] Wisconsin State Mercury Rule [Member] | Dec. 31, 2010 Electric Generating Units Mercury Emission Reduction Percentage [Member] Wisconsin State Mercury Rule [Member] | Dec. 31, 2012 Manufactured Gas Plant Sites [Member] | Dec. 31, 2012 Scenario, Forecast [Member] | Dec. 31, 2012 Scenario, Forecast [Member] Performance guarantees outstanding, 2013 [Member] | Dec. 31, 2012 Scenario, Forecast [Member] Performance guarantees outstanding, 2014 [Member] | Dec. 31, 2012 Scenario, Forecast [Member] Performance guarantees outstanding, 2015 [Member] | Dec. 31, 2012 Alliant Energy and WPL [Member] Scenario, Forecast [Member] Capital Purchase Obligation [Member] | Dec. 31, 2012 IPL [Member] site | Dec. 31, 2011 IPL [Member] | Dec. 31, 2012 IPL [Member] Workforce Subject to Collective Bargaining Arrangements [Member] | Dec. 31, 2012 IPL [Member] Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] | Dec. 31, 2012 IPL [Member] Manufactured Gas Plant Sites [Member] | Dec. 31, 2012 IPL [Member] Scenario, Forecast [Member] | Dec. 31, 2012 WPL [Member] site | Dec. 31, 2011 WPL [Member] | Dec. 31, 2012 WPL [Member] Workforce Subject to Collective Bargaining Arrangements [Member] | Dec. 31, 2012 WPL [Member] Manufactured Gas Plant Sites [Member] | Dec. 31, 2012 WPL [Member] Scenario, Forecast [Member] | May 31, 2011 Cash Balance Plan [Member] | Sep. 30, 2012 Cash Balance Plan [Member] Defined Benefit Pension Plans [Member] | Aug. 31, 2012 Cash Balance Plan [Member] Defined Benefit Pension Plans [Member] | Dec. 31, 2011 Cash Balance Plan [Member] Defined Benefit Pension Plans [Member] | Feb. 28, 2013 Cash Balance Plan [Member] Defined Benefit Pension Plans [Member] Subsequent Event [Member] | Dec. 31, 2012 RMT [Member] Indemnification Agreement [Member]
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum future commitments |  | $ 982,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,000,000 | $ 537,000,000 |  |  |  |  |  | $ 303,000,000 |  |  |  |  |  |  |  |  |  |
Interest crediting rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.20% |  |  |  |  |
Aggregate additional payments to certain plan participants |  |  |  |  |  | 100,000 | [1] | 10,200,000 | [1] | 0 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |
Number of new subclasses certified as a result of court opinion and order | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated damages from court opinion and order |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,700,000 |  |  |
Loss contingency, amount of plaintiff's attorney fees or costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,600,000 |  |  |  |
Loss contingency, amount of plaintiff's attorney fees or costs paid out of common fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000 |  |  |  |
Loss contingency, damages awarded, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,400,000 |
Loss contingency, estimated amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000
Performance guarantees outstanding |  | 615,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 270,000,000 | 294,000,000 | 51,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surety bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Present value abandonment obligation |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites with ownership interest (in sites) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |
Number of sites with no further action (in sites) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |
Sites with no further action for soil remediation (in sites) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum remaining estimated cost incurred for investigation, remediation and monitoring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  |  | 2,000,000 |  |  |  |  |  |
Maximum remaining estimated cost incurred for investigation, remediation and monitoring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,000,000 |  |  |  |  |  |  |  |  |  | 38,000,000 |  |  |  |  | 4,000,000 |  |  |  |  |  |
Current and non-current environmental liabilities |  | $ 29,000,000 | $ 33,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |  | $ 25,700,000 | $ 28,400,000 |  |  | $ 26,000,000 |  | $ 3,300,000 | $ 5,100,000 |  | $ 3,000,000 |  |  |  |  |  |  |
Fossil fueled energy generating units capacity (in megawatts) |  |  |  |  |  |  |  |  |  |  |  | 25 | 25 |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy generating units mercury emission reduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual concentration of mercury emissions (in pounds of mercury per gigawatt-hour) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.008 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of ozone primary standard level (in parts per million) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.075 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual standard fine particle NAAQS, current (in micrograms/cubic meters) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual standard fine particle NAAQS (in micrograms/cubic meters) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One hour NAAQS level (in parts per billion) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual standard NAAQS (in parts per billion) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Emissions rate limitation (in pounds of carbon dioxide per MWh) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  | 55.00% | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67.00% | 44.00% |  |  |  |  | 80.00% |  |  |  |  |  |  |  |
[1] | Alliant Energy reached an agreement with the IRS, which resulted in a favorable determination letter for the Cash Balance Plan in 2011. The agreement with the IRS required Alliant Energy to amend the Cash Balance Plan, which was completed in 2011 resulting in aggregate additional benefits of $10.2 million paid by Alliant Energy to certain former participants in the Cash Balance Plan in 2011. Alliant Energy recognized $10.2 million of additional benefits costs in 2011 related to these benefits. IPL recognized $6.3 million ($2.8 million directly assigned and $3.5 million allocated by Corporate Services) and WPL recognized $3.4 million ($0.7 million directly assigned and $2.7 million allocated by Corporate Services) of additional benefits costs in 2011 related to these benefits. Refer to Note 13(c) for additional information regarding the Cash Balance Plan.

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