v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 07, 2026
Document Information [Line Items]    
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001953520  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Title of 12(b) Security None  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 000-56839  
Entity Registrant Name Fidelity Core Real Estate Fund  
Entity Incorporation, State or Country Code MD  
Entity Address, Address Line One 245 Summer Street  
Entity Address, City or Town Boston  
Entity Address, State or Province MA  
Entity Tax Identification Number 88-6504113  
Entity Address, Postal Zip Code 02210  
City Area Code 617  
Local Phone Number 563-7000  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   37,635,938