Settlement and Other Risk Management - Estimated Settlement Exposure (Details) - Guarantee Obligations - USD ($) $ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Risks Inherent in Servicing Assets and Servicing Liabilities | ||
| Gross settlement exposure | $ 76,269 | $ 78,385 |
| Risk mitigation arrangements applied to settlement exposure | (13,703) | (13,466) |
| Net settlement exposure | $ 62,566 | $ 64,919 |