v3.26.1
BORROWED FUNDS - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Principal balance $ 15,300 $ 11,300
Unamortized deferred issuance costs and/or discounts 66 71
Short-term borrowed funds 1,159 58
Available borrowing capacity 78,300  
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt    
Debt Instrument [Line Items]    
Short-term borrowed funds 11,600 7,100
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Available borrowing capacity $ 18,900 $ 22,100