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INVESTMENT SECURITIES - Narrative (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
security
shares
Dec. 31, 2024
USD ($)
Jan. 24, 2024
USD ($)
shares
Schedule of Investments [Line Items]      
Debt securities, available-for-sale, accrued Interest $ 157,000,000 $ 177,000,000  
Debt Securities, held-to-maturity, accrued interest 20,000,000 20,000,000  
Write off of accrued interest receivable $ 0 0  
Debt securities, held-to-maturity, threshold period past due 30 days    
Securities past due $ 9,647,000,000 10,239,000,000  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 307    
Investment securities available for sale, allowance for credit loss $ 0    
Securities, nonaccrual $ 0 $ 0  
Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List Not Disclosed Flag [Extensible Enumeration] available for sale and held to maturity debt securities available for sale and held to maturity debt securities  
Asset Pledged as Collateral      
Schedule of Investments [Line Items]      
Investment securities, aggregate carrying value, pledged as collateral $ 3,890,000,000 $ 3,940,000,000  
Government sponsored enterprise-issued mortgage-backed securities, government agency securities, or U.S. treasury securities      
Schedule of Investments [Line Items]      
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 288    
Corporate bonds      
Schedule of Investments [Line Items]      
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 19    
Total Past Due      
Schedule of Investments [Line Items]      
Securities past due $ 0 $ 0  
Visa, Inc | Class B      
Schedule of Investments [Line Items]      
Investment owned (in shares) | shares 354    
Investment owned, carrying value $ 0    
Visa, Inc | Class B-1      
Schedule of Investments [Line Items]      
Investment owned (in shares) | shares     354
Investment owned, carrying value     $ 0