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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.