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FAIR VALUE (Schedule of Assets and Liabilities Measured at Fair Value by Class on a Recurring Basis Using Level 3 Inputs) (Details) - Level 3 - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Private equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value of assets, beginning balance $ 116 $ 101 $ 105 $ 92
Unrealized securities gains, net 12 5 36 7
Other noninterest income 0 0 0 0
Purchases 7 1 12 10
Cost of investments sold 0 (2) (6) (4)
Transfers out 0 0 (12) 0
Fair value of assets, ending balance 135 105 135 105
Ag loan servicing        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value of assets, beginning balance 20 20 20 19
Unrealized securities gains, net 0 0 0 0
Other noninterest income (1) (1) (1) 0
Purchases 0 0 0 0
Cost of investments sold 0 0 0 0
Transfers out 0 0 0 0
Fair value of assets, ending balance $ 19 $ 19 $ 19 $ 19