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Insurance Company Regulatory Requirements - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 13, 2013
Sep. 30, 2015
AGM and AGC [Member]    
Statutory Accounting Practices [Line Items]    
Reserves for contingencies reassumed, incremental reassumption, period 3 years  
Reserves for contingencies reassumed   $ 522
New York [Member] | AGM [Member]    
Statutory Accounting Practices [Line Items]    
Threshold for dividend payments as a percentage of policyholder surplus   10.00%
Threshold for dividend payments, percentage of adjusted net investment income   100.00%
Amount available for distribution, current year   $ 215
Amount available for distribution, next fiscal quarter   $ 52
MARYLAND | AGC [Member]    
Statutory Accounting Practices [Line Items]    
Threshold for dividend payments as a percentage of policyholder surplus   10.00%
Threshold for dividend payments, percentage of adjusted net investment income   100.00%
Amount available for distribution, next fiscal quarter   $ 40
MARYLAND | AGUS [Member] | AGC [Member]    
Statutory Accounting Practices [Line Items]    
Amount available for distribution, current year   90
Bermuda [Member] | Assured Guaranty Re [Member]    
Statutory Accounting Practices [Line Items]    
Amount available for distribution, current year   $ 279
Dividend payment restrictions schedule, percentage of statutory capital   15.00%
Dividend payment restrictions schedule amount of statutory capital   $ 127
Dividend restrictions on statutory capital and surplus (as a percent)   25.00%
Statutory surplus   $ 271
Unencumbered assets   $ 611