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Insurance Company Regulatory Requirements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statutory Accounting Practices [Line Items]        
Dividends paid     $ 36 $ 35
Affiliated Entity [Member] | Municipal Assurance Corp [Member] | Municipal Assurance Corp Holdings [Member]        
Statutory Accounting Practices [Line Items]        
Dividends paid $ 12 $ 0 24 0
Affiliated Entity [Member] | AGC [Member] | AGUSH [Member]        
Statutory Accounting Practices [Line Items]        
Dividends paid 23 23 51 23
Affiliated Entity [Member] | AGM [Member] | AGMH [Member]        
Statutory Accounting Practices [Line Items]        
Dividends paid 0 $ 32 79 $ 127
New York [Member] | Municipal Assurance Corp [Member]        
Statutory Accounting Practices [Line Items]        
Amount available for distribution, current year 49   49  
Amount available for distribution, next fiscal quarter 25   $ 25  
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 198   $ 198  
Amount available for distribution, next fiscal quarter 64   $ 64  
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 16   $ 16  
Maryland [Member] | AGUSH [Member] | AGC [Member]        
Statutory Accounting Practices [Line Items]        
Amount available for distribution, current year 107   107  
Bermuda [Member] | Assured Guaranty Re [Member]        
Statutory Accounting Practices [Line Items]        
Amount available for distribution, current year 314   $ 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   314  
Unencumbered assets $ 609   $ 609