v3.26.1
INVESTMENT SECURITIES - Narrative (Details)
shares in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
security
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
security
shares
Dec. 31, 2025
USD ($)
Jan. 24, 2024
shares
Schedule of Investments [Line Items]          
Investment securities available for sale, cost $ 34,510,000,000   $ 34,510,000,000 $ 31,952,000,000  
Investment securities available for sale 33,983,000,000   33,983,000,000 31,790,000,000  
Debt securities, available-for-sale, accrued Interest 177,000,000   177,000,000 157,000,000  
Debt Securities, held-to-maturity, accrued interest 19,000,000   $ 19,000,000 20,000,000  
Write off of accrued interest receivable $ 0 $ 0      
Debt securities, held-to-maturity, threshold period past due 30 days   30 days    
Securities past due $ 9,418,000,000   $ 9,418,000,000 9,647,000,000  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 292   292    
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 1,000,000   1,000,000 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 $ 3,730,000,000   $ 3,730,000,000 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 277   277    
Corporate bonds          
Schedule of Investments [Line Items]          
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 15   15    
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