v3.25.2
Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 14, 2025
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31  
Entity File Number 001-42709  
Entity Registrant Name Pioneer Acquisition I Corp  
Entity Central Index Key 0002040381  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 131 Concord Street  
Entity Address, City or Town Brooklyn  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 11201  
City Area Code 347  
Local Phone Number 720-2907  
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  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company false  
Units, each consisting of one Class A ordinary share and one-half of one warrant    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-half of one warrant  
Trading Symbol PACHU  
Security Exchange Name NASDAQ  
Class A ordinary shares, par value $0.0001 per share    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol PACH  
Security Exchange Name NASDAQ  
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Trading Symbol PACHW  
Security Exchange Name NASDAQ  
Class A Ordinary Shares [Member]    
Entity Common Stock, Shares Outstanding   25,300,000
Class B Ordinary Shares [Member]    
Entity Common Stock, Shares Outstanding   6,325,000