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Loss And Loss Adjustment Expense Reserves (RMBS Reserves) (Narrative) (Detail) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended 0 Months Ended 6 Months Ended 18 Months Ended 24 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Loss And Lae Reserves [Member]
Dec. 31, 2013
Loss And Lae Reserves [Member]
Sep. 30, 2014
Classified [Member]
Loss And Lae Reserves [Member]
Dec. 31, 2013
Classified [Member]
Loss And Lae Reserves [Member]
Aug. 31, 2014
First Lien R M B S Reserves [Member]
Sep. 30, 2014
First Lien R M B S Reserves [Member]
Loss And Lae Reserves [Member]
Dec. 31, 2013
First Lien R M B S Reserves [Member]
Loss And Lae Reserves [Member]
Dec. 31, 2013
First Lien R M B S Reserves [Member]
Variable Interest Entity Primary Beneficiary [Member]
Aug. 31, 2014
First Lien R M B S Reserves [Member]
ALT-A [Member]
Aug. 31, 2014
First Lien R M B S Reserves [Member]
Foreclosure [Member]
Aug. 31, 2014
First Lien R M B S Reserves [Member]
Real Estate Owned [Member]
Aug. 31, 2014
First Lien R M B S Reserves [Member]
Bankruptcy [Member]
Feb. 28, 2015
Rmbs And Heloc And Ces [Member]
Sep. 30, 2014
Rmbs And Heloc And Ces [Member]
Aug. 31, 2014
Rmbs And Heloc And Ces [Member]
Sep. 30, 2015
Rmbs And Heloc And Ces [Member]
Scenario Forecast [Member]
Feb. 28, 2015
Rmbs And Heloc And Ces [Member]
Scenario Forecast [Member]
Feb. 28, 2015
Rmbs And Heloc And Ces [Member]
Scenario Forecast [Member]
Minimum [Member]
Feb. 29, 2016
Rmbs And Heloc And Ces [Member]
Scenario Forecast [Member]
Maximum [Member]
Aug. 31, 2016
Rmbs And Heloc And Ces [Member]
Scenario Forecast [Member]
Maximum [Member]
Feb. 28, 2015
Rmbs And Heloc And Ces [Member]
Scenario Forecast [Member]
Rate Reduction [Member]
Sep. 30, 2014
Rmbs And Heloc And Ces [Member]
Excess Spread [Member]
Dec. 31, 2013
Rmbs And Heloc And Ces [Member]
Excess Spread [Member]
Sep. 30, 2014
Rmbs And Heloc And Ces [Member]
Excess Spread [Member]
Variable Interest Entity Primary Beneficiary [Member]
Dec. 31, 2013
Rmbs And Heloc And Ces [Member]
Excess Spread [Member]
Variable Interest Entity Primary Beneficiary [Member]
Sep. 30, 2014
U S Public Finance Insurance [Member]
Dec. 31, 2013
U S Public Finance Insurance [Member]
Sep. 30, 2014
U S Public Finance Insurance [Member]
General obligations
Dec. 31, 2013
U S Public Finance Insurance [Member]
General obligations
Sep. 30, 2014
U S Public Finance Insurance [Member]
General obligations
Classified [Member]
Dec. 31, 2013
U S Public Finance Insurance [Member]
General obligations
Classified [Member]
Sep. 30, 2014
Second Lien R M B S Securitizations [Member]
Loss And Lae Reserves [Member]
Dec. 31, 2013
Second Lien R M B S Securitizations [Member]
Loss And Lae Reserves [Member]
Sep. 30, 2014
Second Lien R M B S Securitizations [Member]
Variable Interest Entity Primary Beneficiary [Member]
Dec. 31, 2013
Second Lien R M B S Securitizations [Member]
Variable Interest Entity Primary Beneficiary [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]                                                                                
Loss and loss adjustment expense reserves           $ 517,000,000 $ 641,000,000 $ 517,000,000 $ 641,000,000   $ 242,000,000 $ 241,000,000 $ 2,000,000                                   $ 62,000,000 $ 87,000,000         $ 112,000,000 $ 126,000,000 $ 19,000,000 $ 43,000,000
Insurance loss recoverable                                                     529,000,000 647,000,000 141,000,000 183,000,000 11,000,000 13,000,000                
Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Principal 12,424,000,000 [1]   12,424,000,000 [1]   14,264,000,000 [1]                                                       105,500,000,000 124,900,000,000 152,000,000 161,000,000        
Policyholder (Benefits) And Claims Incurred Net 20,000,000 98,000,000 82,000,000 92,000,000                                                     (5,000,000)                  
Total excess spread recoveries                                                     535,000,000 681,000,000 141,000,000 190,000,000                    
Expected recoveries of future payments           95,000,000 206,000,000                                       6,000,000 34,000,000   7,000,000                    
Assumed roll rate for loans                             90.00% 90.00% 75.00%                                              
90+ day roll rate to loss set stress scenario                   90.00%                                                            
Percentage of roll to loss after declining over a 24-month period                           25.00%                                                    
Assumed roll rate for ninety plus day delinquent loans excluding foreclosure and real estate owned                                       95.00%                                        
Period of elevated delinquency and loss for base case, beginning, months                                   6                                            
Percentage of loans in 30-59 days delinquent bucket                                       10.00%                                        
Percentage of loans charged-off                                       30.00%                                        
Percentage of Current Roll to Loss for the transaction                                       3.00%                                        
Decrease in percentage of Current Roll to Loss for transaction                                           25.00%       0.75%                            
Current Roll to Loss                                         0.00%                                      
Period of elevated delinquency and loss for stress case, additional months                                             6   24                              
Addition to case basis reserves if losses remain at peak levels                                     $ 50,000,000                                          
Period Of Current Roll To Loss For Stress Case Additional Months                                             6 18                                
[1]
Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.