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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Selected Information on Modified Loans) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 108 $ 123 $ 240 $ 243
Percentage of total loans 0.20% 0.20% 0.40% 0.40%
Unfunded lending commitments on troubled debt restructuring $ 8 $ 10 $ 8 $ 10
Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 9 0 9 4
Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 49 121 166 236
Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 0 0 2 1
Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 1 1 2 1
Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 49 1 61 1
Commercial        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   $ 39 $ 81 $ 76
Percentage of total loans   0.10% 0.30% 0.30%
Commercial | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   $ 0 $ 9 $ 4
Commercial | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   38 48 71
Commercial | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 0 0
Commercial | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   1 2 1
Commercial | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 22 0
Commercial | Commercial and industrial        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 34 $ 36 $ 77 $ 64
Percentage of total loans 0.20% 0.20% 0.50% 0.40%
Commercial | Commercial and industrial | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 9 $ 0 $ 9 $ 0
Commercial | Commercial and industrial | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 11 35 44 63
Commercial | Commercial and industrial | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 0 0 0 0
Commercial | Commercial and industrial | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 1 1 2 1
Commercial | Commercial and industrial | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 22 0
Commercial | Commercial and industrial | Other | Financing Receivable, Accruing [Member]        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     13  
Commercial | Owner-occupied        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   $ 3 $ 1 $ 12
Percentage of total loans   0.00% 0.00% 0.10%
Commercial | Owner-occupied | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   $ 0 $ 0 $ 4
Commercial | Owner-occupied | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   3 1 8
Commercial | Owner-occupied | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 0 0
Commercial | Owner-occupied | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 0 0
Commercial | Owner-occupied | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 0 0
Commercial | Municipal        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     $ 3  
Percentage of total loans     0.10%  
Commercial | Municipal | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     $ 0  
Commercial | Municipal | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     3  
Commercial | Municipal | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0  
Commercial | Municipal | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0  
Commercial | Municipal | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0  
Commercial real estate        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 74 $ 83 $ 153 $ 164
Percentage of total loans 0.50% 0.60% 1.10% 1.20%
Commercial real estate | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 0 $ 0 $ 0 $ 0
Commercial real estate | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 38 83 117 164
Commercial real estate | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 0 0 0 0
Commercial real estate | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 0 0 0 0
Commercial real estate | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 36 0 36 0
Commercial real estate | Construction and land development        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 5 $ 0 $ 7 $ 23
Percentage of total loans 0.20% 0.00% 0.20% 0.90%
Commercial real estate | Construction and land development | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 0 $ 0 $ 0 $ 0
Commercial real estate | Construction and land development | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 5 0 7 23
Commercial real estate | Construction and land development | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 0 0 0 0
Commercial real estate | Construction and land development | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 0 0 0 0
Commercial real estate | Construction and land development | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 0 0
Commercial real estate | Construction and land development | Other | Financing Receivable, Accruing [Member]        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0  
Commercial real estate | Term        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 69 $ 83 $ 146 $ 141
Percentage of total loans 0.60% 0.80% 1.40% 1.30%
Commercial real estate | Term | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 0 $ 0 $ 0 $ 0
Commercial real estate | Term | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 33 83 110 141
Commercial real estate | Term | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis 0 0 0 0
Commercial real estate | Term | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis $ 0 0 0 0
Commercial real estate | Term | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 36 0
Commercial real estate | Term | Other | Financing Receivable, Accruing [Member]        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     36  
Consumer        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     $ 6 $ 3
Percentage of total loans     0.00% 0.00%
Consumer | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     $ 0 $ 0
Consumer | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     1 1
Consumer | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     2 1
Consumer | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0 0
Consumer | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     3 1
Consumer | Home equity credit line        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     $ 1  
Percentage of total loans     0.00%  
Consumer | Home equity credit line | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     $ 0  
Consumer | Home equity credit line | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0  
Consumer | Home equity credit line | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0  
Consumer | Home equity credit line | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     0  
Consumer | Home equity credit line | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis     1  
Consumer | 1-4 family residential        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   $ 1 $ 4 $ 2
Percentage of total loans   0.00% 0.00% 0.00%
Consumer | 1-4 family residential | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   $ 0 $ 0 $ 0
Consumer | 1-4 family residential | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 0 0
Consumer | 1-4 family residential | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 2 1
Consumer | 1-4 family residential | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   0 0 0
Consumer | 1-4 family residential | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis   $ 1 $ 2 1
Consumer | Bankcard and other revolving plans        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       $ 1
Percentage of total loans       0.20%
Consumer | Bankcard and other revolving plans | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       $ 0
Consumer | Bankcard and other revolving plans | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       1
Consumer | Bankcard and other revolving plans | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       0
Consumer | Bankcard and other revolving plans | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       0
Consumer | Bankcard and other revolving plans | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       0
Consumer | Other        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       $ 1
Percentage of total loans       0.80%
Consumer | Other | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       $ 0
Consumer | Other | Maturity or term extension        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       1
Consumer | Other | Principal forgiveness        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       0
Consumer | Other | Payment deferral        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       0
Consumer | Other | Multiple modification types        
Financing Receivable, Modifications [Line Items]        
Amortized cost basis       $ 0