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BUSINESS SEGMENTS - Schedule of Financial Information for Segments of FNB (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | $ 596.0 |  | $ 583.0 | $ 1,738.0 |  | $ 1,683.0 |  |
Interest expense | 237.0 |  | 260.0 | 708.0 |  | 725.0 |  |
Net Interest Income | 359.0 |  | 323.0 | 1,030.0 |  | 958.0 |  |
Provision for Credit Losses | 24.0 |  | 23.0 | 67.1 |  | 57.5 |  |
Non-interest income: |  |  |  |  |  |  |  |
Service charges | 23.0 |  | 24.0 | 68.0 |  | 68.0 |  |
Interchange and card transaction fees | 13.0 |  | 13.0 | 39.0 |  | 39.0 |  |
Trust services | 12.0 |  | 11.0 | 36.0 |  | 34.0 |  |
Insurance commissions and fees | 5.0 |  | 5.0 | 16.0 |  | 18.0 |  |
Securities commissions and fees | 9.0 |  | 8.0 | 27.0 |  | 24.0 |  |
Capital markets income | 8.0 |  | 6.0 | 20.0 |  | 17.0 |  |
Mortgage banking operations | 9.0 |  | 5.0 | 22.0 |  | 20.0 |  |
Other | 19.0 |  | 17.0 | 49.0 |  | 45.0 |  |
Total Non-Interest Income | 98.0 |  | 89.0 | 277.0 |  | 265.0 |  |
Non-interest expense: |  |  |  |  |  |  |  |
Salaries and employee benefits | 131.0 |  | 126.0 | 396.0 |  | 376.0 |  |
Other | 112.0 |  | 123.0 | 340.0 |  | 337.0 |  |
Total Non-Interest Expense | 243.0 |  | 249.0 | 736.0 |  | 713.0 |  |
Income taxes | 40.0 |  | 30.0 | 107.0 |  | 98.0 |  |
Net Income | 150.0 |  | 110.0 | 397.0 |  | 355.0 |  |
Total assets | 49,889.0 |  | 47,976.0 | 49,889.0 |  | 47,976.0 | $ 48,625.0 |
Total Loans and Leases | 34,957.0 | [1] | 33,717.0 | 34,957.0 | [1] | 33,717.0 | 33,939.0 | [1]
Total deposits | 38,441.0 |  | 36,771.0 | 38,441.0 |  | 36,771.0 | $ 37,107.0 |
Market value of assets under administration - FNBIA, FNTC and FNIS | 14,885.0 |  | 14,115.0 | 14,885.0 |  | 14,115.0 |  |
Operating Segments | Community Banking |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | 595.0 |  | 582.0 | 1,734.0 |  | 1,679.0 |  |
Interest expense | 225.0 |  | 252.0 | 667.0 |  | 703.0 |  |
Net Interest Income | 370.0 |  | 330.0 | 1,067.0 |  | 976.0 |  |
Provision for Credit Losses | 24.0 |  | 23.0 | 67.0 |  | 57.0 |  |
Non-interest income: |  |  |  |  |  |  |  |
Service charges | 23.0 |  | 24.0 | 68.0 |  | 68.0 |  |
Interchange and card transaction fees | 13.0 |  | 13.0 | 39.0 |  | 39.0 |  |
Trust services | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Insurance commissions and fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Securities commissions and fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Capital markets income | 6.0 |  | 5.0 | 16.0 |  | 15.0 |  |
Mortgage banking operations | 9.0 |  | 5.0 | 22.0 |  | 20.0 |  |
Other | 22.0 |  | 20.0 | 57.0 |  | 52.0 |  |
Total Non-Interest Income | 73.0 |  | 67.0 | 202.0 |  | 194.0 |  |
Non-interest expense: |  |  |  |  |  |  |  |
Salaries and employee benefits | 117.0 |  | 112.0 | 352.0 |  | 332.0 |  |
Other | 102.0 |  | 114.0 | 306.0 |  | 313.0 |  |
Total Non-Interest Expense | 219.0 |  | 226.0 | 658.0 |  | 645.0 |  |
Income taxes | 42.0 |  | 32.0 | 116.0 |  | 102.0 |  |
Net Income | 158.0 |  | 116.0 | 428.0 |  | 366.0 |  |
Total assets | 49,547.0 |  | 47,662.0 | 49,547.0 |  | 47,662.0 |  |
Total Loans and Leases | 34,911.0 |  | 33,671.0 | 34,911.0 |  | 33,671.0 |  |
Total deposits | 38,894.0 |  | 37,112.0 | 38,894.0 |  | 37,112.0 |  |
Market value of assets under administration - FNBIA, FNTC and FNIS | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Operating Segments | Wealth Management |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Interest expense | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Net Interest Income | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Provision for Credit Losses | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Non-interest income: |  |  |  |  |  |  |  |
Service charges | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Interchange and card transaction fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Trust services | 12.0 |  | 11.0 | 36.0 |  | 34.0 |  |
Insurance commissions and fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Securities commissions and fees | 9.0 |  | 8.0 | 27.0 |  | 24.0 |  |
Capital markets income | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Mortgage banking operations | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Other | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Total Non-Interest Income | 21.0 |  | 19.0 | 63.0 |  | 58.0 |  |
Non-interest expense: |  |  |  |  |  |  |  |
Salaries and employee benefits | 11.0 |  | 11.0 | 32.0 |  | 33.0 |  |
Other | 3.0 |  | 2.0 | 10.0 |  | 7.0 |  |
Total Non-Interest Expense | 14.0 |  | 13.0 | 42.0 |  | 40.0 |  |
Income taxes | 2.0 |  | 1.0 | 5.0 |  | 4.0 |  |
Net Income | 5.0 |  | 5.0 | 16.0 |  | 14.0 |  |
Total assets | 47.0 |  | 41.0 | 47.0 |  | 41.0 |  |
Total Loans and Leases | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Total deposits | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Market value of assets under administration - FNBIA, FNTC and FNIS | 14,885.0 |  | 14,115.0 | 14,885.0 |  | 14,115.0 |  |
Operating Segments | Insurance |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Interest expense | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Net Interest Income | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Provision for Credit Losses | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Non-interest income: |  |  |  |  |  |  |  |
Service charges | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Interchange and card transaction fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Trust services | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Insurance commissions and fees | 5.0 |  | 5.0 | 16.0 |  | 18.0 |  |
Securities commissions and fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Capital markets income | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Mortgage banking operations | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Other | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Total Non-Interest Income | 5.0 |  | 5.0 | 16.0 |  | 18.0 |  |
Non-interest expense: |  |  |  |  |  |  |  |
Salaries and employee benefits | 3.0 |  | 4.0 | 11.0 |  | 11.0 |  |
Other | 2.0 |  | 1.0 | 4.0 |  | 4.0 |  |
Total Non-Interest Expense | 5.0 |  | 5.0 | 15.0 |  | 15.0 |  |
Income taxes | 0.0 |  | 0.0 | 0.0 |  | 1.0 |  |
Net Income | 0.0 |  | 0.0 | 1.0 |  | 2.0 |  |
Total assets | 31.0 |  | 32.0 | 31.0 |  | 32.0 |  |
Total Loans and Leases | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Total deposits | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Market value of assets under administration - FNBIA, FNTC and FNIS | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Parent and Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | 1.0 |  | 1.0 | 4.0 |  | 4.0 |  |
Interest expense | 12.0 |  | 8.0 | 41.0 |  | 22.0 |  |
Net Interest Income | (11.0) |  | (7.0) | (37.0) |  | (18.0) |  |
Provision for Credit Losses | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Non-interest income: |  |  |  |  |  |  |  |
Service charges | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Interchange and card transaction fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Trust services | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Insurance commissions and fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Securities commissions and fees | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Capital markets income | 2.0 |  | 1.0 | 4.0 |  | 2.0 |  |
Mortgage banking operations | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |
Other | (3.0) |  | (3.0) | (8.0) |  | (7.0) |  |
Total Non-Interest Income | (1.0) |  | (2.0) | (4.0) |  | (5.0) |  |
Non-interest expense: |  |  |  |  |  |  |  |
Salaries and employee benefits | 0.0 |  | (1.0) | 1.0 |  | 0.0 |  |
Other | 5.0 |  | 6.0 | 20.0 |  | 13.0 |  |
Total Non-Interest Expense | 5.0 |  | 5.0 | 21.0 |  | 13.0 |  |
Income taxes | (4.0) |  | (3.0) | (14.0) |  | (9.0) |  |
Net Income | (13.0) |  | (11.0) | (48.0) |  | (27.0) |  |
Total assets | 264.0 |  | 241.0 | 264.0 |  | 241.0 |  |
Total Loans and Leases | 46.0 |  | 46.0 | 46.0 |  | 46.0 |  |
Total deposits | (453.0) |  | (341.0) | (453.0) |  | (341.0) |  |
Market value of assets under administration - FNBIA, FNTC and FNIS | $ 0.0 |  | $ 0.0 | $ 0.0 |  | $ 0.0 |  |
[1] | Amount represents loans for which we have elected the fair value option. See Note 18.

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