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BUSINESS COMBINATIONS (Details)
$ in Millions
 12 Months Ended
Mar. 27, 2025
Mar. 27, 2023
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Oct. 16, 2025
USD ($)
branch
Business Combination [Line Items]            
Gain on acquisition     $ 0 $ 0 $ 9,808  
Purchase Money Note            
Business Combination [Line Items]            
Debt instrument, term 5 years 5 years        
Notes payable   $ 36,070        
Advance Facility Agreement            
Business Combination [Line Items]            
Advance facility agreement   70,000        
BMO Bank            
Business Combination [Line Items]            
Branches acquired | branch           138
Deposit liabilities assumed           $ 5,700
Loans acquired           $ 1,100
SVBB            
Business Combination [Line Items]            
Gain on acquisition         9,810  
Net of income taxes         $ 3,360  
Business combination, financing receivable acquired, amount covered by share-loss agreement   $ 60,000        
Business combination, financing receivable acquired, amount covered by share-loss agreement, coverage percentage for loss up to $5 billion   0.00%        
Business combination, financing receivable acquired, amount covered by share-loss agreement, coverage percentage for loss in excess of $5 billion   $ 5,000        
Business combination, financing receivable acquired, above threshold amount covered by share-loss agreement, percentage   50.00%        
Share-loss agreement, reimbursement percentage   50.00%