v3.26.1
OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 6,759 $ 6,302
Other comprehensive income (loss) before reclassifications (23)  
Other Comprehensive Income (Loss) (23) 48
Balance at end of period 6,801 6,418
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (63) (169)
Balance at end of period (86) $ (121)
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 (18)  
Other Comprehensive Income (Loss) (18)  
Balance at end of period (61)  
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 (5)  
Other Comprehensive Income (Loss) (5)  
Balance at end of period 5  
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  
Other Comprehensive Income (Loss) 0  
Balance at end of period $ (30)