v3.26.3
INVESTMENT SECURITIES - Narrative (Details)
shares in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
security
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
security
shares
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Jan. 24, 2024
shares
Schedule of Investments [Line Items]            
Investment securities available for sale, cost $ 36,827,000,000   $ 36,827,000,000   $ 31,952,000,000  
Investment securities available for sale 35,606,000,000   35,606,000,000   31,790,000,000  
Debt securities, available-for-sale, accrued Interest 199,000,000   199,000,000   157,000,000  
Debt Securities, held-to-maturity, accrued interest 18,000,000   18,000,000   20,000,000  
Write off of accrued interest receivable $ 0 $ 0 $ 0 $ 0    
Debt securities, held-to-maturity, threshold period past due 30 days   30 days      
Securities past due $ 9,157,000,000   $ 9,157,000,000   9,647,000,000  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 290   290      
Investment securities available for sale, allowance for credit loss $ 0   $ 0      
Securities, nonaccrual 0   $ 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  
Other            
Schedule of Investments [Line Items]            
Investment securities available for sale, cost 18,000,000   $ 18,000,000   $ 0  
Investment securities available for sale 18,000,000   18,000,000   0  
Securities past due 2,000,000   2,000,000   1,000,000  
Other | Standard & Poor's, AAA Or AA Rating            
Schedule of Investments [Line Items]            
Investment securities available for sale 14,000,000   14,000,000      
Asset Pledged as Collateral            
Schedule of Investments [Line Items]            
Investment securities, aggregate carrying value, pledged as collateral $ 3,550,000,000   $ 3,550,000,000   3,890,000,000  
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 278   278      
Corporate bonds            
Schedule of Investments [Line Items]            
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 12   12      
Total Past Due            
Schedule of Investments [Line Items]            
Securities past due $ 0   $ 0   $ 0  
Visa, Inc | Class B common stock            
Schedule of Investments [Line Items]            
Investment owned (in shares) | shares 354   354      
Visa, Inc | Class B-1            
Schedule of Investments [Line Items]            
Investment owned (in shares) | shares           354