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Insurance Company Regulatory Requirements - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Municipal Assurance Corp [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, next fiscal quarter $ 12
New York [Member] | Municipal Assurance Corp [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, current year $ 27
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 $ 185
Amount available for distribution, next fiscal quarter $ 59
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
Maryland [Member] | AGUSH [Member] | AGC [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, current year 133
Bermuda [Member] | Assured Guaranty Re [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, current year $ 324
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 324
Unencumbered assets $ 437