{"cik":352541,"taxonomy":"us-gaap","tag":"LongTermDebtNoncurrent","label":"Long-term Debt, Excluding Current Maturities","description":"Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"ALLIANT ENERGY CORP","units":{"USD":[{"end":"2009-12-31","val":2404500000,"accn":"0001193125-10-179039","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-05"},{"end":"2009-12-31","val":2404500000,"accn":"0001193125-10-240771","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-29"},{"end":"2009-12-31","val":2404500000,"accn":"0001193125-11-049662","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2009Q4I"},{"end":"2010-06-30","val":2503600000,"accn":"0001193125-10-179039","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-05","frame":"CY2010Q2I"},{"end":"2010-09-30","val":2703800000,"accn":"0001193125-10-240771","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-29","frame":"CY2010Q3I"},{"end":"2010-12-31","val":2703400000,"accn":"0001193125-11-049662","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"end":"2010-12-31","val":2703400000,"accn":"0001193125-11-127887","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-05"},{"end":"2010-12-31","val":2703400000,"accn":"0001193125-11-211511","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"end":"2010-12-31","val":2703400000,"accn":"0001193125-11-295400","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03"},{"end":"2010-12-31","val":2703400000,"accn":"0001193125-12-081622","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27","frame":"CY2010Q4I"},{"end":"2011-03-31","val":2703600000,"accn":"0001193125-11-127887","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-05","frame":"CY2011Q1I"},{"end":"2011-06-30","val":2703500000,"accn":"0001193125-11-211511","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05","frame":"CY2011Q2I"},{"end":"2011-09-30","val":2703600000,"accn":"0001193125-11-295400","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03","frame":"CY2011Q3I"},{"end":"2011-12-31","val":2703100000,"accn":"0001193125-12-081622","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27"},{"end":"2011-12-31","val":2703100000,"accn":"0001193125-12-211596","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-04"},{"end":"2011-12-31","val":2703100000,"accn":"0000352541-12-000008","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03"},{"end":"2011-12-31","val":2703100000,"accn":"0000352541-12-000017","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":2703100000,"accn":"0000352541-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011Q4I"},{"end":"2012-03-31","val":2728200000,"accn":"0001193125-12-211596","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-04","frame":"CY2012Q1I"},{"end":"2012-06-30","val":2752800000,"accn":"0000352541-12-000008","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03","frame":"CY2012Q2I"},{"end":"2012-09-30","val":2828100000,"accn":"0000352541-12-000017","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":3136600000,"accn":"0000352541-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26"},{"end":"2012-12-31","val":3136600000,"accn":"0000352541-13-000012","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03"},{"end":"2012-12-31","val":3136600000,"accn":"0000352541-13-000020","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-02"},{"end":"2012-12-31","val":3136600000,"accn":"0000352541-13-000026","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":3136600000,"accn":"0000352541-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2012Q4I"},{"end":"2013-03-31","val":3121900000,"accn":"0000352541-13-000012","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03","frame":"CY2013Q1I"},{"end":"2013-06-30","val":3141400000,"accn":"0000352541-13-000020","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-02","frame":"CY2013Q2I"},{"end":"2013-09-30","val":3104800000,"accn":"0000352541-13-000026","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":2977800000,"accn":"0000352541-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25"},{"end":"2013-12-31","val":2977800000,"accn":"0000352541-14-000011","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02"},{"end":"2013-12-31","val":2977800000,"accn":"0000352541-14-000019","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2013-12-31","val":2977800000,"accn":"0000352541-14-000025","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07"},{"end":"2013-12-31","val":2977800000,"accn":"0000352541-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25","frame":"CY2013Q4I"},{"end":"2014-03-31","val":2980600000,"accn":"0000352541-14-000011","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02","frame":"CY2014Q1I"},{"end":"2014-06-30","val":2829900000,"accn":"0000352541-14-000019","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07","frame":"CY2014Q2I"},{"end":"2014-09-30","val":2799500000,"accn":"0000352541-14-000025","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07","frame":"CY2014Q3I"},{"end":"2014-12-31","val":3606700000,"accn":"0000352541-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2014-12-31","val":3606700000,"accn":"0000352541-15-000011","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-01"},{"end":"2014-12-31","val":3606700000,"accn":"0000352541-15-000022","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06"},{"end":"2014-12-31","val":3606700000,"accn":"0000352541-15-000030","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06"},{"end":"2014-12-31","val":3584300000,"accn":"0000352541-16-000076","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24","frame":"CY2014Q4I"},{"end":"2015-03-31","val":3606700000,"accn":"0000352541-15-000011","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-01","frame":"CY2015Q1I"},{"end":"2015-06-30","val":3717400000,"accn":"0000352541-15-000022","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06","frame":"CY2015Q2I"},{"end":"2015-09-30","val":3855800000,"accn":"0000352541-15-000030","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2015Q3I"},{"end":"2015-12-31","val":3522200000,"accn":"0000352541-16-000076","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24"},{"end":"2015-12-31","val":3522200000,"accn":"0000352541-16-000116","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05"},{"end":"2015-12-31","val":3522200000,"accn":"0000352541-16-000165","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02"},{"end":"2015-12-31","val":3522200000,"accn":"0000352541-16-000203","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"end":"2015-12-31","val":3522200000,"accn":"0000352541-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015Q4I"},{"end":"2016-03-31","val":3522700000,"accn":"0000352541-16-000116","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":3588400000,"accn":"0000352541-16-000165","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02","frame":"CY2016Q2I"},{"end":"2016-09-30","val":3816900000,"accn":"0000352541-16-000203","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2016Q3I"},{"end":"2016-12-31","val":4315600000,"accn":"0000352541-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24"},{"end":"2016-12-31","val":4315600000,"accn":"0000352541-17-000054","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04"},{"end":"2016-12-31","val":4315600000,"accn":"0000352541-17-000081","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-04"},{"end":"2016-12-31","val":4315600000,"accn":"0000352541-17-000103","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03"},{"end":"2016-12-31","val":4315600000,"accn":"0000352541-18-000019","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23","frame":"CY2016Q4I"},{"end":"2017-03-31","val":4316100000,"accn":"0000352541-17-000054","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04","frame":"CY2017Q1I"},{"end":"2017-06-30","val":4354300000,"accn":"0000352541-17-000081","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-04","frame":"CY2017Q2I"},{"end":"2017-09-30","val":4255100000,"accn":"0000352541-17-000103","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03","frame":"CY2017Q3I"},{"end":"2017-12-31","val":4010600000,"accn":"0000352541-18-000019","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23"},{"end":"2017-12-31","val":4010600000,"accn":"0000352541-18-000051","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-03"},{"end":"2017-12-31","val":4010600000,"accn":"0000352541-18-000078","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"end":"2017-12-31","val":4010600000,"accn":"0000352541-18-000089","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"end":"2017-12-31","val":4010600000,"accn":"0000352541-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22","frame":"CY2017Q4I"},{"end":"2018-03-31","val":4056800000,"accn":"0000352541-18-000051","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-03","frame":"CY2018Q1I"},{"end":"2018-06-30","val":5127500000,"accn":"0000352541-18-000078","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03","frame":"CY2018Q2I"},{"end":"2018-09-30","val":5248200000,"accn":"0000352541-18-000089","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2018Q3I"},{"end":"2018-12-31","val":5246300000,"accn":"0000352541-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22"},{"end":"2018-12-31","val":5246300000,"accn":"0000352541-19-000053","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-03"},{"end":"2018-12-31","val":5246300000,"accn":"0000352541-19-000082","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-02"},{"end":"2018-12-31","val":5246300000,"accn":"0000352541-19-000099","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-07"},{"end":"2018-12-31","val":5246300000,"accn":"0000352541-20-000021","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-21","frame":"CY2018Q4I"},{"end":"2019-03-31","val":5362200000,"accn":"0000352541-19-000053","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-03","frame":"CY2019Q1I"},{"end":"2019-06-30","val":5438100000,"accn":"0000352541-19-000082","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-02","frame":"CY2019Q2I"},{"end":"2019-09-30","val":5535100000,"accn":"0000352541-19-000099","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-07","frame":"CY2019Q3I"},{"end":"2019-12-31","val":5533000000,"accn":"0000352541-20-000021","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-21"},{"end":"2019-12-31","val":5533000000,"accn":"0000352541-20-000064","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08"},{"end":"2019-12-31","val":5533000000,"accn":"0000352541-20-000090","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-10"},{"end":"2019-12-31","val":5533000000,"accn":"0000352541-20-000108","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03"},{"end":"2019-12-31","val":5533000000,"accn":"0000352541-21-000022","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-19","frame":"CY2019Q4I"},{"end":"2020-03-31","val":5833900000,"accn":"0000352541-20-000064","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08","frame":"CY2020Q1I"},{"end":"2020-06-30","val":6572400000,"accn":"0000352541-20-000090","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-10","frame":"CY2020Q2I"},{"end":"2020-09-30","val":6574000000,"accn":"0000352541-20-000108","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03","frame":"CY2020Q3I"},{"end":"2020-12-31","val":6769000000,"accn":"0000352541-21-000022","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-19"},{"end":"2020-12-31","val":6769000000,"accn":"0000352541-21-000056","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-07"},{"end":"2020-12-31","val":6769000000,"accn":"0000352541-21-000076","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-06"},{"end":"2020-12-31","val":6769000000,"accn":"0000352541-21-000095","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-05"},{"end":"2020-12-31","val":6769000000,"accn":"0000352541-22-000020","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-18","frame":"CY2020Q4I"},{"end":"2021-03-31","val":6471000000,"accn":"0000352541-21-000056","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-07","frame":"CY2021Q1I"},{"end":"2021-06-30","val":6468000000,"accn":"0000352541-21-000076","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-06","frame":"CY2021Q2I"},{"end":"2021-09-30","val":6692000000,"accn":"0000352541-21-000095","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-05","frame":"CY2021Q3I"},{"end":"2021-12-31","val":6735000000,"accn":"0000352541-22-000020","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-18"},{"end":"2021-12-31","val":6735000000,"accn":"0000352541-22-000058","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-04-29"},{"end":"2021-12-31","val":6735000000,"accn":"0000352541-22-000075","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-05"},{"end":"2021-12-31","val":6735000000,"accn":"0000352541-22-000082","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-08"},{"end":"2021-12-31","val":6735000000,"accn":"0000352541-23-000017","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-24","frame":"CY2021Q4I"},{"end":"2022-03-31","val":7383000000,"accn":"0000352541-22-000058","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-04-29","frame":"CY2022Q1I"},{"end":"2022-06-30","val":6981000000,"accn":"0000352541-22-000075","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-05","frame":"CY2022Q2I"},{"end":"2022-09-30","val":7570000000,"accn":"0000352541-22-000082","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-08","frame":"CY2022Q3I"},{"end":"2022-12-31","val":7668000000,"accn":"0000352541-23-000017","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-24"},{"end":"2022-12-31","val":7668000000,"accn":"0000352541-23-000059","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-05"},{"end":"2022-12-31","val":7668000000,"accn":"0000352541-23-000091","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-04"},{"end":"2022-12-31","val":7668000000,"accn":"0000352541-23-000108","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-03"},{"end":"2022-12-31","val":7668000000,"accn":"0000352541-24-000014","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-16","frame":"CY2022Q4I"},{"end":"2023-03-31","val":8132000000,"accn":"0000352541-23-000059","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-05","frame":"CY2023Q1I"},{"end":"2023-06-30","val":8186000000,"accn":"0000352541-23-000091","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-04","frame":"CY2023Q2I"},{"end":"2023-09-30","val":8429000000,"accn":"0000352541-23-000108","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-03","frame":"CY2023Q3I"},{"end":"2023-12-31","val":8225000000,"accn":"0000352541-24-000014","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-16"},{"end":"2023-12-31","val":8225000000,"accn":"0000352541-24-000058","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-03"},{"end":"2023-12-31","val":8225000000,"accn":"0000352541-24-000089","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-02"},{"end":"2023-12-31","val":8225000000,"accn":"0000352541-24-000104","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-01"},{"end":"2023-12-31","val":8225000000,"accn":"0000352541-25-000014","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-21","frame":"CY2023Q4I"},{"end":"2024-03-31","val":8524000000,"accn":"0000352541-24-000058","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-03","frame":"CY2024Q1I"},{"end":"2024-06-30","val":8900000000,"accn":"0000352541-24-000089","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-02","frame":"CY2024Q2I"},{"end":"2024-09-30","val":9245000000,"accn":"0000352541-24-000104","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-01","frame":"CY2024Q3I"},{"end":"2024-12-31","val":8677000000,"accn":"0000352541-25-000014","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-21"},{"end":"2024-12-31","val":8677000000,"accn":"0000352541-25-000053","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-09"},{"end":"2024-12-31","val":8677000000,"accn":"0000352541-25-000072","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-08"},{"end":"2024-12-31","val":8677000000,"accn":"0000352541-25-000081","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-07"},{"end":"2024-12-31","val":8677000000,"accn":"0000352541-26-000007","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-20","frame":"CY2024Q4I"},{"end":"2025-03-31","val":8580000000,"accn":"0000352541-25-000053","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-09","frame":"CY2025Q1I"},{"end":"2025-06-30","val":9642000000,"accn":"0000352541-25-000072","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-08","frame":"CY2025Q2I"},{"end":"2025-09-30","val":10655000000,"accn":"0000352541-25-000081","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-07","frame":"CY2025Q3I"},{"end":"2025-12-31","val":10954000000,"accn":"0000352541-26-000007","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-20"},{"end":"2025-12-31","val":10954000000,"accn":"0000352541-26-000033","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-01","frame":"CY2025Q4I"},{"end":"2026-03-31","val":11007000000,"accn":"0000352541-26-000033","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-01","frame":"CY2026Q1I"}]}}