{"cik":52485,"taxonomy":"us-gaap","tag":"EarningsPerShareBasic","label":"Earnings Per Share, Basic","description":"The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.","entityName":"ALLIANT ENERGY CORP","units":{"USD/shares":[{"start":"2025-01-01","end":"2025-06-30","val":1.51,"accn":"0000352541-26-000043","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-07-31"},{"start":"2025-04-01","end":"2025-06-30","val":0.68,"accn":"0000352541-26-000043","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-07-31","frame":"CY2025Q2"},{"start":"2026-01-01","end":"2026-06-30","val":1.53,"accn":"0000352541-26-000043","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-07-31"},{"start":"2026-04-01","end":"2026-06-30","val":0.66,"accn":"0000352541-26-000043","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-07-31","frame":"CY2026Q2"}]}}