{"cik":52485,"taxonomy":"us-gaap","tag":"OtherAssetsCurrent","label":"Other Assets, Current","description":"Amount of current assets classified as other.","entityName":"INTERSTATE POWER & LIGHT CO","units":{"USD":[{"end":"2025-12-31","val":210000000,"accn":"0000352541-26-000043","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-07-31","frame":"CY2025Q4I"},{"end":"2026-06-30","val":284000000,"accn":"0000352541-26-000043","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-07-31","frame":"CY2026Q2I"}]}}