Property, Plant and Equipment	6 Months Ended
Property, Plant and Equipment	Jun. 30, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Environmental Compliance Plans Emission Controls Projects - IPL’s George Neal Unit 3 - Construction of the scrubber and baghouse at George Neal Unit 3 was completed in May 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress - Other” to “Electric plant” on Alliant Energy’s and IPL’s balance sheets in 2014. As of June 30, 2014, the capitalized project costs consisted of capital expenditures of $58 million and AFUDC of $4 million for IPL’s allocated portion of the George Neal Unit 3 scrubber and baghouse. WPL’s Columbia Units 1 and 2 - Construction of the scrubber and baghouse at Columbia Unit 2 was completed in April 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress - Other” to “Electric plant” on Alliant Energy’s and WPL’s balance sheets in 2014. As of June 30, 2014, the capitalized project costs consisted of capital expenditures of $152 million and AFUDC of $8 million for WPL’s allocated portion of the Columbia Unit 2 scrubber and baghouse and certain expenditures applicable to both Columbia Unit 1 and 2. Construction of the scrubber and baghouse at Columbia Unit 1 was completed in July 2014. As of June 30, 2014, Alliant Energy and WPL recorded capitalized expenditures of $116 million and AFUDC of $7 million for WPL’s allocated portion of the Columbia Unit 1 scrubber and baghouse in “Construction work in progress - Other” on their balance sheets.
IPL [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Environmental Compliance Plans Emission Controls Projects - IPL’s George Neal Unit 3 - Construction of the scrubber and baghouse at George Neal Unit 3 was completed in May 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress - Other” to “Electric plant” on Alliant Energy’s and IPL’s balance sheets in 2014. As of June 30, 2014, the capitalized project costs consisted of capital expenditures of $58 million and AFUDC of $4 million for IPL’s allocated portion of the George Neal Unit 3 scrubber and baghouse. WPL’s Columbia Units 1 and 2 - Construction of the scrubber and baghouse at Columbia Unit 2 was completed in April 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress - Other” to “Electric plant” on Alliant Energy’s and WPL’s balance sheets in 2014. As of June 30, 2014, the capitalized project costs consisted of capital expenditures of $152 million and AFUDC of $8 million for WPL’s allocated portion of the Columbia Unit 2 scrubber and baghouse and certain expenditures applicable to both Columbia Unit 1 and 2. Construction of the scrubber and baghouse at Columbia Unit 1 was completed in July 2014. As of June 30, 2014, Alliant Energy and WPL recorded capitalized expenditures of $116 million and AFUDC of $7 million for WPL’s allocated portion of the Columbia Unit 1 scrubber and baghouse in “Construction work in progress - Other” on their balance sheets.
WPL [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Environmental Compliance Plans Emission Controls Projects - IPL’s George Neal Unit 3 - Construction of the scrubber and baghouse at George Neal Unit 3 was completed in May 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress - Other” to “Electric plant” on Alliant Energy’s and IPL’s balance sheets in 2014. As of June 30, 2014, the capitalized project costs consisted of capital expenditures of $58 million and AFUDC of $4 million for IPL’s allocated portion of the George Neal Unit 3 scrubber and baghouse. WPL’s Columbia Units 1 and 2 - Construction of the scrubber and baghouse at Columbia Unit 2 was completed in April 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress - Other” to “Electric plant” on Alliant Energy’s and WPL’s balance sheets in 2014. As of June 30, 2014, the capitalized project costs consisted of capital expenditures of $152 million and AFUDC of $8 million for WPL’s allocated portion of the Columbia Unit 2 scrubber and baghouse and certain expenditures applicable to both Columbia Unit 1 and 2. Construction of the scrubber and baghouse at Columbia Unit 1 was completed in July 2014. As of June 30, 2014, Alliant Energy and WPL recorded capitalized expenditures of $116 million and AFUDC of $7 million for WPL’s allocated portion of the Columbia Unit 1 scrubber and baghouse in “Construction work in progress - Other” on their balance sheets.

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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