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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Changes in the Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Allowance for loan losses        
Balance at beginning of period $ 690 $ 696 $ 696 $ 684
Provision for loan losses 45 1 65 34
Total 67 15 107 50
Recoveries 11 12 25 26
Net loan and lease charge-offs (recoveries) 56 3 82 24
Balance at end of period 679 694 679 694
Reserve for unfunded lending commitments        
Balance at beginning of period 42 30 45 45
Provision for unfunded lending commitments 4 12 1 (3)
Balance at end of period 46 42 46 42
Total allowance for credit losses 725 736 725 736
Commercial:        
Allowance for loan losses        
Balance at beginning of period 361 302 308 302
Provision for loan losses 57 7 129 15
Total 61 12 92 30
Recoveries 9 9 21 19
Net loan and lease charge-offs (recoveries) 52 3 71 11
Balance at end of period 366 306 366 306
Reserve for unfunded lending commitments        
Balance at beginning of period 22 16 26 19
Provision for unfunded lending commitments 1 4 (3) 1
Balance at end of period 23 20 23 20
Total allowance for credit losses 389 326 389 326
Commercial real estate:        
Allowance for loan losses        
Balance at beginning of period 230 300 300 241
Provision for loan losses (11) (13) (80) 56
Total 3 0 4 11
Recoveries 1 2 1 3
Net loan and lease charge-offs (recoveries) 2 (2) 3 8
Balance at end of period 217 289 217 289
Reserve for unfunded lending commitments        
Balance at beginning of period 12 7 11 17
Provision for unfunded lending commitments 4 5 5 (5)
Balance at end of period 16 12 16 12
Total allowance for credit losses 233 301 233 301
Consumer:        
Allowance for loan losses        
Balance at beginning of period 99 94 88 141
Provision for loan losses (1) 7 16 (37)
Total 3 3 11 9
Recoveries 1 1 3 4
Net loan and lease charge-offs (recoveries) 2 2 8 5
Balance at end of period 96 99 96 99
Reserve for unfunded lending commitments        
Balance at beginning of period 8 7 8 9
Provision for unfunded lending commitments (1) 3 (1) 1
Balance at end of period 7 10 7 10
Total allowance for credit losses $ 103 $ 109 $ 103 $ 109