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Property, Plant and Equipment	3 Months Ended
Property, Plant and Equipment	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Utility - Emission Controls Project - WPL’s Edgewater Unit 5 - WPL is currently constructing a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions at the EGU. Construction began in 2014 and is expected to be completed in 2016. As of March 31, 2016, Alliant Energy and WPL recorded capitalized expenditures for construction work in progress of $207 million and AFUDC of $10 million for the scrubber and baghouse in “Property, plant and equipment, net” on their balance sheets. Natural Gas-Fired Generation Project - IPL’s Marshalltown Generating Station - IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. Construction began in 2014 and is expected to be completed in 2017. As of March 31, 2016, Alliant Energy and IPL recorded capitalized expenditures for construction work in progress of $492 million and AFUDC of $33 million for Marshalltown in “Property, plant and equipment, net” on their balance sheets.
IPL [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Utility - Emission Controls Project - WPL’s Edgewater Unit 5 - WPL is currently constructing a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions at the EGU. Construction began in 2014 and is expected to be completed in 2016. As of March 31, 2016, Alliant Energy and WPL recorded capitalized expenditures for construction work in progress of $207 million and AFUDC of $10 million for the scrubber and baghouse in “Property, plant and equipment, net” on their balance sheets. Natural Gas-Fired Generation Project - IPL’s Marshalltown Generating Station - IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. Construction began in 2014 and is expected to be completed in 2017. As of March 31, 2016, Alliant Energy and IPL recorded capitalized expenditures for construction work in progress of $492 million and AFUDC of $33 million for Marshalltown in “Property, plant and equipment, net” on their balance sheets.
WPL [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT Utility - Emission Controls Project - WPL’s Edgewater Unit 5 - WPL is currently constructing a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions at the EGU. Construction began in 2014 and is expected to be completed in 2016. As of March 31, 2016, Alliant Energy and WPL recorded capitalized expenditures for construction work in progress of $207 million and AFUDC of $10 million for the scrubber and baghouse in “Property, plant and equipment, net” on their balance sheets.