Pledged Assets, Accepted Collateral and Restricted Assets (Type of Pledged Assets) (Details) - Collateral that may be repledged or sold - USD ($) $ in Billions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Financial Instruments Owned and Pledged as Collateral [Line Items] | ||
| Total Pledged Assets | $ 42.7 | $ 38.8 |
| Debt Securities | ||
| Financial Instruments Owned and Pledged as Collateral [Line Items] | ||
| Total Pledged Assets | 33.3 | 29.3 |
| Loans | ||
| Financial Instruments Owned and Pledged as Collateral [Line Items] | ||
| Total Pledged Assets | $ 9.4 | $ 9.5 |