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Outstanding Exposure - Debt Service Outstanding (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Schedule of Insured Financial Obligations [Line Items]    
Gross Debt Service Outstanding $ 382,301 $ 408,492
Net Debt Service Outstanding 378,693 401,118
Public Finance [Member]    
Schedule of Insured Financial Obligations [Line Items]    
Gross Debt Service Outstanding 367,910 393,010
Net Debt Service Outstanding 364,731 386,092
Structured Finance [Member]    
Schedule of Insured Financial Obligations [Line Items]    
Gross Debt Service Outstanding 14,391 15,482
Net Debt Service Outstanding $ 13,962 $ 15,026