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Insurance Company Regulatory Requirements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jul. 31, 2013
MAC Holdings
Jun. 30, 2013
Maryland
Assured Guaranty Corp
Jun. 30, 2012
Maryland
Assured Guaranty Corp
Jun. 30, 2013
Maryland
Assured Guaranty Corp
Jun. 30, 2012
Maryland
Assured Guaranty Corp
Jun. 30, 2013
Maryland
Assured Guaranty Corp
Jun. 30, 2013
New York
Assured Guaranty Municipal Corp
Jun. 30, 2012
New York
Assured Guaranty Municipal Corp
Jun. 30, 2013
New York
Assured Guaranty Municipal Corp
Jun. 30, 2012
New York
Assured Guaranty Municipal Corp
Jun. 30, 2013
New York
Assured Guaranty Municipal Corp
Jun. 30, 2013
Bermuda
Assured Guaranty Re
Jun. 30, 2012
Bermuda
Assured Guaranty Re
Jun. 30, 2013
Bermuda
Assured Guaranty Re
Jun. 30, 2012
Bermuda
Assured Guaranty Re
Jul. 31, 2013
Bermuda
Assured Guaranty Re
Jun. 30, 2013
Minimum
Bermuda
Assured Guaranty Re
Jun. 30, 2013
Maximum
Bermuda
Assured Guaranty Re
Insurance company regulatory requirements                                    
Amount available for distribution   $ 73   $ 73   $ 73 $ 141   $ 141   $ 141 $ 321   $ 321        
Unencumbered Asset                               280    
Excess capital and surplus based on regulatory capital requirements                       600   600        
Maximum dividend and statutory surplus requirement                                   440
Dividend restrictions on statutory capital and surplus (as a percent)                                 25.00%  
Period for filing affidavit prior to dividend payment (in days)                       7 days            
Dividend restrictions on statutory capital (as a percent)                       15.00%            
Dividend restrictions on statutory capital                       126            
Relevant assets as a percentage of relevant liabilities                                 75.00%  
Dividends paid   17 40 17 55 17 38 0 38 30 38 60 40 100 70      
Holding company's percent ownership of common stock 100.00%                                  
Repayments of Related Party Debt             $ 0 $ 50 $ 25 $ 50