Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Service
Gross	$ 419,634	$ 416,463
Net	419,136	415,966
Par Outstanding
Gross	264,072	262,032
Net	263,591	261,552
Public finance
Debt Service
Gross	407,005	403,789
Net	406,933	403,718
Par Outstanding
Gross	252,586	250,429
Net	252,531	250,375
Structured finance
Debt Service
Gross	12,629	12,674
Net	12,203	12,248
Par Outstanding
Gross	11,486	11,603
Net	$ 11,060	$ 11,177