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BUSINESS SEGMENTS - Schedule of Financial Information for Segments of FNB (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Interest income $ 2,326.0 $ 2,252.0 $ 1,973.0
Interest expense 930.0 972.0 656.0
Net interest income (loss) 1,396.0 1,280.0 1,317.0
Provision for credit losses 86.0 79.8 72.0
Non-interest income:      
Service charges 92.0 91.0 82.0
Interchange and card transaction fees 52.0 52.0 52.0
Trust services 48.0 46.0 43.0
Insurance commissions and fees 20.0 22.0 23.0
Securities commissions and fees 36.0 31.0 28.0
Capital markets income 27.0 24.0 27.0
Mortgage banking operations 28.0 27.0 21.0
Other 66.0 23.0 (22.0)
Total Non-Interest Income 369.0 316.0 254.0
Non-Interest Expense      
Salaries and employee benefits 530.0 504.0 462.0
Other 480.0 457.0 453.0
Total Non-Interest Expense 1,010.0 961.0 915.0
Income tax expense (benefit) 104.0 90.0 99.0
Net Income 565.0 465.0 485.0
Total assets 50,229.0 48,625.0 46,158.0
Total loans and leases 34,777.0 [1] 33,939.0 [1] 32,323.0
Total deposits 38,759.0 37,107.0 34,711.0
Market value of assets under management 14,885.0 14,217.0 12,853.0
Operating Segments | Community Banking      
Segment Reporting Information [Line Items]      
Interest income 2,320.0 2,246.0 1,967.0
Interest expense 881.0 941.0 624.0
Net interest income (loss) 1,439.0 1,305.0 1,343.0
Provision for credit losses 86.0 79.0 72.0
Non-interest income:      
Service charges 92.0 91.0 82.0
Interchange and card transaction fees 52.0 52.0 52.0
Trust services 0.0 0.0 0.0
Insurance commissions and fees 0.0 1.0 1.0
Securities commissions and fees 0.0 0.0 0.0
Capital markets income 23.0 21.0 25.0
Mortgage banking operations 28.0 27.0 21.0
Other 75.0 31.0 (15.0)
Total Non-Interest Income 270.0 223.0 166.0
Non-Interest Expense      
Salaries and employee benefits 470.0 445.0 406.0
Other 416.0 426.0 430.0
Total Non-Interest Expense 886.0 871.0 836.0
Income tax expense (benefit) 119.0 97.0 106.0
Net Income 618.0 481.0 495.0
Total assets 49,909.0 48,295.0 45,924.0
Total loans and leases 34,739.0 33,895.0 32,281.0
Total deposits 39,098.0 37,973.0 35,127.0
Market value of assets under management 0.0 0.0 0.0
Operating Segments | Wealth Manage- ment      
Segment Reporting Information [Line Items]      
Interest income 0.0 0.0 0.0
Interest expense 0.0 0.0 0.0
Net interest income (loss) 0.0 0.0 0.0
Provision for credit losses 0.0 0.0 0.0
Non-interest income:      
Service charges 0.0 0.0 0.0
Interchange and card transaction fees 0.0 0.0 0.0
Trust services 48.0 46.0 43.0
Insurance commissions and fees 0.0 0.0 0.0
Securities commissions and fees 36.0 31.0 28.0
Capital markets income 0.0 0.0 0.0
Mortgage banking operations 0.0 0.0 0.0
Other 0.0 0.0 0.0
Total Non-Interest Income 84.0 77.0 71.0
Non-Interest Expense      
Salaries and employee benefits 43.0 45.0 41.0
Other 12.0 9.0 9.0
Total Non-Interest Expense 55.0 54.0 50.0
Income tax expense (benefit) 6.0 5.0 5.0
Net Income 23.0 18.0 16.0
Total assets 48.0 44.0 40.0
Total loans and leases 0.0 0.0 0.0
Total deposits 0.0 0.0 0.0
Market value of assets under management 14,885.0 14,217.0 12,853.0
Operating Segments | Insurance      
Segment Reporting Information [Line Items]      
Interest income 0.0 0.0 0.0
Interest expense 0.0 0.0 0.0
Net interest income (loss) 0.0 0.0 0.0
Provision for credit losses 0.0 0.0 0.0
Non-interest income:      
Service charges 0.0 0.0 0.0
Interchange and card transaction fees 0.0 0.0 0.0
Trust services 0.0 0.0 0.0
Insurance commissions and fees 20.0 23.0 22.0
Securities commissions and fees 0.0 0.0 0.0
Capital markets income 0.0 0.0 0.0
Mortgage banking operations 0.0 0.0 0.0
Other 0.0 0.0 0.0
Total Non-Interest Income 20.0 23.0 22.0
Non-Interest Expense      
Salaries and employee benefits 15.0 14.0 14.0
Other 5.0 5.0 4.0
Total Non-Interest Expense 20.0 19.0 18.0
Income tax expense (benefit) 0.0 1.0 1.0
Net Income 0.0 3.0 3.0
Total assets 30.0 31.0 29.0
Total loans and leases 0.0 0.0 0.0
Total deposits 0.0 0.0 0.0
Market value of assets under management 0.0 0.0 0.0
Parent and Other      
Segment Reporting Information [Line Items]      
Interest income 6.0 6.0 6.0
Interest expense 49.0 31.0 32.0
Net interest income (loss) (43.0) (25.0) (26.0)
Provision for credit losses 0.0 1.0 0.0
Non-interest income:      
Service charges 0.0 0.0 0.0
Interchange and card transaction fees 0.0 0.0 0.0
Trust services 0.0 0.0 0.0
Insurance commissions and fees 0.0 (2.0) 0.0
Securities commissions and fees 0.0 0.0 0.0
Capital markets income 4.0 3.0 2.0
Mortgage banking operations 0.0 0.0 0.0
Other (9.0) (8.0) (7.0)
Total Non-Interest Income (5.0) (7.0) (5.0)
Non-Interest Expense      
Salaries and employee benefits 2.0 0.0 1.0
Other 47.0 17.0 10.0
Total Non-Interest Expense 49.0 17.0 11.0
Income tax expense (benefit) (21.0) (13.0) (13.0)
Net Income (76.0) (37.0) (29.0)
Total assets 242.0 255.0 165.0
Total loans and leases 38.0 44.0 42.0
Total deposits (339.0) (866.0) (416.0)
Market value of assets under management $ 0.0 $ 0.0 $ 0.0
[1] Amount represents loans for which we have elected the fair value option. See Note 25.