v3.26.1
LONG-TERM DEBT AND SHAREHOLDERS' EQUITY (Amounts Reclassified from AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Securities gains (losses), net $ 269 $ 14 $ 272 $ 20
Interest and fees on loans; Interest on short- and long-term borrowings 859 875 1,700 1,725
Less: Income tax expense (benefit) 130 68 191 137
Net income 453 244 686 414
Net unrealized gains (losses) on investment securities | Amounts reclassified from AOCI        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Securities gains (losses), net (57) (62) (110) (120)
Less: Income tax expense (benefit) (14) (15) (27) (30)
Net income (43) (47) (83) (90)
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 (11) (18) (22) (37)
Less: Income tax expense (benefit) (3) (5) (5) (9)
Net income $ (8) $ (13) $ (17) $ (28)