v3.25.2
Investment Securities (Fair Value of Securities Pledged and Accepted as Collateral) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Summary of Investment Holdings [Line Items]    
Permitted by contract or custom to sell or repledge $ 1,421 $ 1,231
Permitted amount repledged to others 1,421 1,231
Asset Pledged as Collateral    
Summary of Investment Holdings [Line Items]    
Debt securities, pledged to others $ 66,610 $ 69,330