v3.26.1
OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 6,801 $ 6,418 $ 6,759 $ 6,302
Other comprehensive income (loss) before reclassifications     (39)  
Amounts reclassified from AOCI     (1)  
Other Comprehensive Income (Loss) (17) 29 (40) 77
Balance at end of period 6,839 6,524 6,839 6,524
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (86) (121) (63) (169)
Balance at end of period (103) $ (92) (103) $ (92)
Unrealized Net Gains (Losses) on Debt Securities Available for Sale        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     (43)  
Other comprehensive income (loss) before reclassifications     (27)  
Amounts reclassified from AOCI     0  
Other Comprehensive Income (Loss)     (27)  
Balance at end of period (70)   (70)  
Unrealized Net Gains (Losses) on Derivative Instruments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     10  
Other comprehensive income (loss) before reclassifications     (12)  
Amounts reclassified from AOCI     (1)  
Other Comprehensive Income (Loss)     (13)  
Balance at end of period (3)   (3)  
Unrecognized Pension and Postretirement Obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     (30)  
Other comprehensive income (loss) before reclassifications     0  
Amounts reclassified from AOCI     0  
Other Comprehensive Income (Loss)     0  
Balance at end of period $ (30)   $ (30)