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Business and Risks (Narrative) (Detail) (USD $)
Share data in Millions, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
May 07, 2013
numberofinstitutions
Sep. 30, 2013
Sep. 30, 2013
segments
Sep. 30, 2013
Mbia Inc [Member]
Dec. 31, 2012
Mbia Inc [Member]
Sep. 30, 2013
Mbia Corp [Member]
Dec. 31, 2012
Mbia Corp [Member]
Sep. 30, 2013
National [Member]
Oct. 02, 2013
National [Member]
SubsequentEvent [Member]
May 06, 2013
Bank Of America [Member]
May 06, 2013
Blue Ridge [Member]
Sep. 30, 2013
Blue Ridge [Member]
May 07, 2013
Societe Generale [Member]
May 02, 2013
Flagstar Bank [Member]
Aug. 05, 2013
Warburg Pincus [Member]
Mar. 31, 2013
Amount Outstanding [Member]
May 06, 2013
Amount Outstanding Before Bofa Settlement [Member]
May 06, 2013
Cash [Member]
Bank Of America [Member]
Sep. 30, 2013
MBIA Inc Senior Notes [Member]
May 06, 2013
MBIA Inc Senior Notes [Member]
Bank Of America [Member]
May 06, 2013
CMBS Pool Insured Gross Par [Member]
Bank Of America [Member]
Business Acquisition [Line Items]                                          
Number of operating segments     3                                    
Severance costs   $ 18,000,000                                      
Headcount reduction percentage   21.00% 21.00%                                    
Impairment of real estate               29,000,000                          
Litigation settlement expense     89,000,000                                    
Proceeds from legal settlements                   1,700,000,000       110,000,000       1,600,000,000   136,000,000  
MBIA debt coupon rate       5.70%                             5.70%    
Warrant term                     5 years       5 years            
Warrants outstanding                     9.94       1.91            
Warrant exercise price                     9.59       9.59            
Settlement without prejudice term                   1 year                      
Line of credit maximum amount                     500,000,000                    
Line of credit amount outstanding                       50,000,000                  
Line of credit term                     3 years                    
National secured loan                               1,700,000,000 1,600,000,000        
Number of resolved Article 78 plaintiffs 18                                        
Dividends from subsidiaries                 214,000,000                        
Liquid assets       282,000,000 239,000,000 97,000,000 345,000,000                            
Amount released from tax escrow account       115,000,000                                  
Commuted gross insured exposure           $ 19,900,000,000       $ 7,400,000,000     $ 4,200,000,000               $ 6,100,000,000