Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Service [Abstract]
Gross	$ 374,698	$ 370,172
Net	374,475	369,951
Par Outstanding
Gross	236,565	233,438
Net	236,383	233,258
Public finance
Debt Service [Abstract]
Gross	363,914	359,899
Net	363,717	359,703
Par Outstanding
Gross	226,902	224,254
Net	226,746	224,099
Structured finance
Debt Service [Abstract]
Gross	10,784	10,273
Net	10,758	10,248
Par Outstanding
Gross	9,663	9,184
Net	$ 9,637	$ 9,159