Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Service
Gross	$ 395,350	$ 398,037
Net	394,849	397,636
Par Outstanding
Gross	248,626	249,535
Net	248,144	249,153
Public finance
Debt Service
Gross	383,723	386,494
Net	383,648	386,419
Par Outstanding
Gross	238,188	239,352
Net	238,132	239,296
Structured finance
Debt Service
Gross	11,627	11,543
Net	11,201	11,217
Par Outstanding
Gross	10,438	10,183
Net	$ 10,012	$ 9,857