0002039835 2025-01-01 2025-12-31 0002039835 aee:UnionElectricCompanyMember 2025-01-01 2025-12-31 0002039835 2025-12-31 iso4217:USD shares 0002039835 2025 FY false 0 0 0000100826 2025 FY false 10-K true 2025-12-31 --12-31 false 333-282616-01 Ameren Missouri Securitization Funding I, LLC 33-1368847 DE 1901 Chouteau Avenue St. Louis MO 63103 (314) 621-3222 1-2967 Union Electric Company 43-0559760 MO 1901 Chouteau Avenue St. Louis MO 63103 (314) 621-3222 No Yes No No Yes Yes Non-accelerated Filer false false false false false PricewaterhouseCoopers LLP 238 St. Louis, Missouri <div style="margin-top:10pt;text-align:center"><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%">None</span></div>