v3.26.1
GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,404 $ 539
Accumulated Amortization (435) (394)
Net Carrying Value 969 145
Core deposit intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,328 473
Accumulated Amortization (375) (335)
Net Carrying Value 953 138
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 76 66
Accumulated Amortization (60) (59)
Net Carrying Value $ 16 $ 7