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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Schedule of Changes in Components of AOCI (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]      
Beginning balance, shareholders' equity $ 22,228 $ 21,255 $ 9,662
AOCI activity before reclassifications 533 45  
Amounts reclassified from AOCI to earnings (5) 1  
Other comprehensive income, net of tax 528 46 244
Ending balance, shareholders' equity 22,238 22,228 21,255
Total accumulated other comprehensive income (loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance, shareholders' equity (445) (491) (735)
Other comprehensive income, net of tax 528 46 244
Ending balance, shareholders' equity 83 (445) (491)
Unrealized loss on securities available for sale      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance, shareholders' equity (584) (577)  
AOCI activity before reclassifications 449 (7)  
Amounts reclassified from AOCI to earnings (2) 0  
Other comprehensive income, net of tax 447 (7)  
Ending balance, shareholders' equity (137) (584) (577)
Unrealized loss on securities available for sale transferred to held to maturity      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance, shareholders' equity (4) (5)  
AOCI activity before reclassifications 0 0  
Amounts reclassified from AOCI to earnings 0 1  
Other comprehensive income, net of tax 0 1  
Ending balance, shareholders' equity (4) (4) (5)
Defined benefit pension items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance, shareholders' equity 135 91  
AOCI activity before reclassifications 75 44  
Amounts reclassified from AOCI to earnings 0 0  
Other comprehensive income, net of tax 75 44  
Ending balance, shareholders' equity 210 135 91
Unrealized gain on cash flow hedge derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance, shareholders' equity 8 0  
AOCI activity before reclassifications 9 8  
Amounts reclassified from AOCI to earnings (3) 0  
Other comprehensive income, net of tax 6 8  
Ending balance, shareholders' equity $ 14 $ 8 $ 0