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Insurance Company Regulatory Requirements - Insurance Regulatory Amounts Reported (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 01, 2016
Jul. 17, 2013
AGM [Member]          
Statutory Accounting Practices [Line Items]          
Policyholders' surplus $ 2,254 $ 2,321      
Net Income (Loss) 152 191 $ 217    
MAC [Member]          
Statutory Accounting Practices [Line Items]          
Policyholders' surplus 270 487      
Net Income (Loss) 32 142 102    
AGC [Member]          
Statutory Accounting Practices [Line Items]          
Policyholders' surplus 2,073 1,896      
Net Income (Loss) 219 108 (92)    
Assured Guaranty Re [Member]          
Statutory Accounting Practices [Line Items]          
Policyholders' surplus 1,294 1,255      
Net Income (Loss) $ 156 $ 139 $ 51    
Subsidiaries [Member] | AGM [Member] | Municipal Assurance Corp Holdings [Member]          
Statutory Accounting Practices [Line Items]          
Holding company's percent ownership of common stock         61.00%
Subsidiaries [Member] | MAC [Member] | Municipal Assurance Corp Holdings [Member]          
Statutory Accounting Practices [Line Items]          
Holding company's percent ownership of common stock         100.00%
Subsidiaries [Member] | AGC [Member] | Municipal Assurance Corp Holdings [Member]          
Statutory Accounting Practices [Line Items]          
Holding company's percent ownership of common stock         39.00%
MBIA UK [Member] | AGC [Member]          
Statutory Accounting Practices [Line Items]          
Policyholders' surplus       $ 36  
CIFG Holding Inc. [Member] | AGC [Member]          
Statutory Accounting Practices [Line Items]          
Policyholders' surplus       $ 287