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LONG-TERM DEBT AND SHAREHOLDERS' EQUITY (Amounts Reclassified from AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Securities gains (losses), net $ 11 $ 9 $ 31 $ 11
Interest and fees on loans; Interest on short- and long-term borrowings 898 899 2,623 2,641
Less: Income tax expense (benefit) 63 63 200 174
Net income 222 214 636 568
Net unrealized gains (losses) on investment securities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Securities gains (losses), net (62) (67) (182) (195)
Less: Income tax expense (benefit) (15) (16) (45) (48)
Net income (47) (51) (137) (147)
Net unrealized gains (losses) on derivatives and other | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and fees on loans; Interest on short- and long-term borrowings (15) (28) (52) (93)
Less: Income tax expense (benefit) (4) (7) (13) (23)
Net income $ (11) $ (21) $ (39) $ (70)