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Insurance Company Regulatory Requirements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statutory Accounting Practices [Line Items]    
Dividends paid $ 19 $ 18
Affiliated Entity [Member] | Municipal Assurance Corp [Member] | Municipal Assurance Corp Holdings [Member]    
Statutory Accounting Practices [Line Items]    
Dividends paid 12 0
Affiliated Entity [Member] | AGC [Member] | AGUSH [Member]    
Statutory Accounting Practices [Line Items]    
Dividends paid 28 0
Affiliated Entity [Member] | AGM [Member] | Assured Guaranty Municipal Holdings Inc [Member]    
Statutory Accounting Practices [Line Items]    
Dividends paid 79 $ 95
New York [Member] | Municipal Assurance Corp [Member]    
Statutory Accounting Practices [Line Items]    
Amount available for distribution, current year 49  
Amount available for distribution, next fiscal quarter $ 37  
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 $ 192  
Amount available for distribution, next fiscal quarter $ 0  
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] | AGUSH [Member] | AGC [Member]    
Statutory Accounting Practices [Line Items]    
Amount available for distribution, current year 107  
Bermuda [Member] | Assured Guaranty Re [Member]    
Statutory Accounting Practices [Line Items]    
Amount available for distribution, current year $ 314  
Dividend payment restrictions schedule, percentage of statutory capital 15.00%  
Dividend restrictions on statutory capital and surplus (as a percent) 25.00%  
Dividend payment restrictions schedule amount of statutory capital $ 128  
Statutory surplus 314  
Unencumbered assets $ 543