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OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 6,302 $ 6,050 $ 5,653
Other comprehensive income (loss) before reclassifications 91    
Amounts reclassified from AOCI 15    
Other Comprehensive Income (Loss) 106 66 122
Balance at end of period 6,759 6,302 6,050
Unrealized Net Gains (Losses) on Debt Securities Available for Sale      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (119)    
Other comprehensive income (loss) before reclassifications 76    
Amounts reclassified from AOCI 0    
Other Comprehensive Income (Loss) 76    
Balance at end of period (43) (119)  
Unrealized Net Gains (Losses) on Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (15)    
Other comprehensive income (loss) before reclassifications 10    
Amounts reclassified from AOCI 15    
Other Comprehensive Income (Loss) 25    
Balance at end of period 10 (15)  
Unrecognized Pension and Postretirement Obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (35)    
Other comprehensive income (loss) before reclassifications 5    
Amounts reclassified from AOCI 0    
Other Comprehensive Income (Loss) 5    
Balance at end of period (30) (35)  
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (169) (235) (357)
Balance at end of period $ (63) $ (169) $ (235)