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Insurance Company Regulatory Requirements - Narrative (Details) - USD ($)
$ in Millions
5 Months Ended 6 Months Ended
Dec. 31, 2013
Jun. 30, 2015
AGM and AGC [Member]    
Statutory Accounting Practices [Line Items]    
Reserves for contingencies reassumed   $ 428
New York [Member] | Assured Guaranty (Europe) and Assured Guaranty Municipal Corp. [Member]    
Statutory Accounting Practices [Line Items]    
Contingency reserves reassumed, amount $ 250  
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   $ 218
Amount available for distribution, next fiscal quarter   $ 57
MARYLAND | AGC [Member]    
Statutory Accounting Practices [Line Items]    
Reassumed contingency reserves $ 267  
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   $ 16
MARYLAND | AGUS [Member] | AGC [Member]    
Statutory Accounting Practices [Line Items]    
Dividend restrictions on outstanding statutory surplus   $ 90
Bermuda [Member] | Assured Guaranty Re [Member]    
Statutory Accounting Practices [Line Items]    
Dividend payment restrictions schedule, percentage of statutory capital   15.00%
Dividend restrictions on outstanding statutory surplus   $ 279
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   $ 566