Outstanding Exposure - Puerto Rico Gross Par and Gross Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Schedule of Insured Financial Obligations [Line Items]
Gross Debt Service Outstanding	$ 484,571	$ 559,470
Puerto Rico [Member]
Schedule of Insured Financial Obligations [Line Items]
Gross par outstanding	5,437	5,755
Gross Debt Service Outstanding	$ 9,041	$ 9,632