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Insurance Company Regulatory Requirements - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
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 $ 236
Amount available for distribution, next fiscal quarter $ 32
Maryland [Member] | 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 $ 24
Maryland [Member] | AGUS [Member] | AGC [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, current year 79
Bermuda [Member] | Assured Guaranty Re [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, current year $ 246
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 $ 140
Unencumbered assets $ 594