Document and Entity Information - shares
9 Months Ended
Sep. 30, 2020
Oct. 30, 2020
Entity Information [Line Items]  
Document Type10-Q 
Document Quarterly Reporttrue 
Document Period End DateSep. 30, 2020 
Document Transition Reportfalse 
Entity File Number1-14756 
Entity Registrant NameAmeren Corporation 
Entity Tax Identification Number43-1723446 
Entity Incorporation, State or Country CodeMO 
Entity Address, Address Line One1901 Chouteau Avenue 
Entity Address, City or TownSt. Louis 
Entity Address, State or ProvinceMO 
Entity Address, Postal Zip Code63103 
City Area Code(314) 
Local Phone Number621-3222 
Title of 12(b) SecurityCommon Stock, $0.01 par value per share 
Trading Symbol(s)AEE 
Security Exchange NameNYSE 
Entity Current Reporting StatusYes 
Entity Interactive Data CurrentYes 
Entity Filer CategoryLarge Accelerated Filer 
Entity Small Businessfalse 
Entity Emerging Growth Companyfalse 
Entity Shell Companyfalse 
Entity Common Stock, Shares Outstanding 247,206,978
Entity Central Index Key0001002910 
Current Fiscal Year End Date--12-31 
Document Fiscal Year Focus2020 
Document Fiscal Period FocusQ3 
Amendment Flagfalse 
Union Electric Company  
Entity Information [Line Items]  
Entity File Number1-2967 
Entity Registrant NameUnion Electric Company 
Entity Tax Identification Number43-0559760 
Entity Incorporation, State or Country CodeMO 
Entity Address, Address Line One1901 Chouteau Avenue 
Entity Address, City or TownSt. Louis 
Entity Address, State or ProvinceMO 
Entity Address, Postal Zip Code63103 
City Area Code(314) 
Local Phone Number621-3222 
Entity Current Reporting StatusYes 
Entity Interactive Data CurrentYes 
Entity Filer CategoryNon-accelerated Filer 
Entity Small Businessfalse 
Entity Emerging Growth Companyfalse 
Entity Shell Companyfalse 
Entity Common Stock, Shares Outstanding 102,123,834
Entity Central Index Key0000100826 
Current Fiscal Year End Date--12-31 
Document Fiscal Year Focus2020 
Document Fiscal Period FocusQ3 
Amendment Flagfalse 
Ameren Illinois Company  
Entity Information [Line Items]  
Entity File Number1-3672 
Entity Registrant NameAmeren Illinois Company 
Entity Tax Identification Number37-0211380 
Entity Incorporation, State or Country CodeIL 
Entity Address, Address Line One10 Executive Drive 
Entity Address, City or TownCollinsville 
Entity Address, State or ProvinceIL 
Entity Address, Postal Zip Code62234 
City Area Code(618) 
Local Phone Number343-8150 
Entity Current Reporting StatusYes 
Entity Interactive Data CurrentYes 
Entity Filer CategoryNon-accelerated Filer 
Entity Small Businessfalse 
Entity Emerging Growth Companyfalse 
Entity Shell Companyfalse 
Entity Common Stock, Shares Outstanding 25,452,373
Entity Central Index Key0000018654 
Current Fiscal Year End Date--12-31 
Document Fiscal Year Focus2020 
Document Fiscal Period FocusQ3 
Amendment Flagfalse 

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