| Submission | Dec. 05, 2024 |
| Submission [Line Items] | |
| Central Index Key | 0000037808 |
| Registrant Name | FNB CORP/PA/ |
| Registration File Number | 333-281868 |
| Form Type | S-3 |
| Submission Type | 424B2 |
| Fee Exhibit Type | EX-FILING FEES |
| Offerings - Offering: 1 | Dec. 05, 2024 USD ($) shares |
| Offering: | |
| Fee Previously Paid | false |
| Rule 457(r) | true |
| Security Type | Debt |
| Security Class Title | 5.722% Fixed Rate / Floating Rate Senior Notes due 2030 |
| Amount Registered | shares | 500,000,000 |
| Maximum Aggregate Offering Price | $ 500,000,000 |
| Fee Rate | 0.01531% |
| Amount of Registration Fee | $ 76,550 |
| Offering Note | 1) Registrant has elected to pay the filing fees on a deferred basis pursuant to Rules 456(b) and 457(r) under the Securities Act of 1933. |
| Fees Summary | Dec. 05, 2024 USD ($) |
| Fees Summary [Line Items] | |
| Total Offering | $ 500,000,000 |
| Previously Paid Amount | 0 |
| Total Fee Amount | 76,550 |
| Total Offset Amount | 0 |
| Net Fee | $ 76,550 |
