{"cik":100826,"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":"Ameren Corporation","units":{"USD/shares":[{"start":"2025-01-01","end":"2025-09-30","val":4.46,"accn":"0001002910-26-000032","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-11-06"},{"start":"2025-07-01","end":"2025-09-30","val":2.37,"accn":"0001002910-26-000032","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-11-06","frame":"CY2025Q3"},{"start":"2026-01-01","end":"2026-09-30","val":4.87,"accn":"0001002910-26-000032","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-11-06"},{"start":"2026-07-01","end":"2026-09-30","val":2.44,"accn":"0001002910-26-000032","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-11-06","frame":"CY2026Q3"}]}}