Pledged Assets and Collateral - Collateral (Details) - USD ($) $ in Billions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Commitments and Contingencies Disclosure [Abstract] | ||
| Collateral permitted to be sold or repledged, delivered, or otherwise used | $ 2,099.6 | $ 1,771.0 |
| Collateral sold, repledged, delivered or otherwise used | $ 1,710.3 | $ 1,426.4 |