v3.25.2
LONG-TERM DEBT AND SHAREHOLDERS' EQUITY (Amounts Reclassified from AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Securities gains (losses), net $ 14 $ 4 $ 20 $ 2
Interest and fees on loans; Interest on short- and long-term borrowings 875 877 1,725 1,742
Less: Income tax expense (benefit) 68 61 137 111
Net income 244 201 414 354
Net unrealized gains (losses) on investment securities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Securities gains (losses), net (62) (67) (120) (128)
Less: Income tax expense (benefit) (15) (17) (30) (32)
Net income (47) (50) (90) (96)
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 (18) (31) (37) (65)
Less: Income tax expense (benefit) (5) (8) (9) (16)
Net income $ (13) $ (23) $ (28) $ (49)