v3.25.4
SHORT-TERM BORROWINGS (Summary of Short-Term Borrowings) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Short-term Debt [Line Items]    
Year-end balance $ 3,104 $ 3,832
Securities sold, not yet purchased 135 20
Total federal funds and other short-term borrowings 3,104 3,832
Federal Home Loan Bank advances    
Short-term Debt [Line Items]    
Average amount outstanding $ 3,837 $ 1,665
Average rate 4.47% 4.89%
Highest month-end balance $ 5,500 $ 2,525
Year-end balance $ 2,000 $ 2,525
Average rate on outstanding advances at year-end 3.97% 4.78%
Total federal funds and other short-term borrowings $ 2,000 $ 2,525
Federal funds purchased    
Short-term Debt [Line Items]    
Other short-term borrowings, year-end balances 244 108
Security repurchase agreements    
Short-term Debt [Line Items]    
Other short-term borrowings, year-end balances 493 764
Swap Margin Collateral    
Short-term Debt [Line Items]    
Other short-term borrowings, year-end balances $ 232 $ 415