v3.25.2
Cover
Jul. 17, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jul. 17, 2025
Entity Registrant Name FNB CORP/PA/
Entity Incorporation, State or Country Code PA
Entity File Number 001-31940
Entity Tax Identification Number 25-1255406
Entity Address, Address Line One 626 Washington Place,
Entity Address, City or Town Pittsburgh,
Entity Address, State or Province PA
Entity Address, Postal Zip Code 15219
City Area Code 800
Local Phone Number 555-5455
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol FNB
Security Exchange Name NYSE
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000037808
Amendment Flag false