Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Debt Service
Gross	$ 384,198		$ 370,172
Net	383,976		369,951
Par Outstanding
Gross	242,009		233,438
Net	241,833	$ 108	233,258
Public finance
Debt Service
Gross	372,908		359,899
Net	372,711		359,703
Par Outstanding
Gross	231,871		224,254
Net	231,721		224,099
Structured finance
Debt Service
Gross	11,290		10,273
Net	11,265		10,248
Par Outstanding
Gross	10,138		9,184
Net	$ 10,112		$ 9,159