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BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Cadence) (Details) - USD ($)
$ in Millions
Feb. 01, 2026
Jan. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Liabilities assumed        
Goodwill     $ 9,527 $ 5,997
Cadence        
Business Combination [Line Items]        
Total consideration $ 8,335 $ 8,300    
Assets acquired        
Cash and due from banks 490      
Interest-earning deposits with banks 1,368      
Available-for-sale securities 8,964      
Other securities 259      
Loans held for sale 151      
Loans and leases 36,912      
Allowance for loan and lease losses (567)      
Net loans and leases 36,345      
Bank-owned life insurance 768      
Premises and equipment 738      
Servicing rights and other intangible assets 1,005      
Other assets 1,258      
Total assets acquired 51,346      
Liabilities assumed        
Deposits 43,530      
Short-term borrowings 1,553      
Long-term debt 945      
Other liabilities 480      
Total liabilities assumed 46,508      
Fair value of net assets acquired 4,838      
Goodwill 3,497      
Cadence | Common Stock        
Business Combination [Line Items]        
Fair value of equity interests 8,068      
Cadence | Equity-based Awards        
Business Combination [Line Items]        
Fair value of equity interests 117      
Cadence | Preferred Stock        
Business Combination [Line Items]        
Fair value of equity interests $ 150