XML 12 R1.htm IDEA: XBRL DOCUMENT v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
May 14, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name CANTOR EQUITY PARTNERS IV, INC.  
Entity Central Index Key 0002034267  
Entity File Number 001-42809  
Entity Tax Identification Number 98-1601014  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Address, Address Line One 110 East 59th Street  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10022  
City Area Code (212)  
Local Phone Number 938-5000  
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol CEPF  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   45,900,000
Class B Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   11,250,000