{"cik":720515,"taxonomy":"us-gaap","tag":"Assets","label":"Assets","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.","entityName":"BASIN ELECTRIC POWER COOPERATIVE","units":{"USD":[{"end":"2025-12-31","val":9397657000,"accn":"0001628280-26-044203","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-06-18"},{"end":"2025-12-31","val":9397657000,"accn":"0000720515-26-000015","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-11","frame":"CY2025Q4I"},{"end":"2026-03-31","val":9482652000,"accn":"0001628280-26-044203","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-06-18","frame":"CY2026Q1I"},{"end":"2026-06-30","val":9581035000,"accn":"0000720515-26-000015","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-11","frame":"CY2026Q2I"}]}}