Outstanding Exposure - Puerto Rico Gross Par and Gross Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items]
Gross Par Outstanding	$ 227,243	$ 236,765
Gross	356,894	367,770
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Gross Par Outstanding	2,088	3,629
Gross	$ 2,944	$ 5,322