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Business Developments, Risks And Uncertainties, And Liquidity (Narrative) (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
MBIA Corp [Member]
Sep. 30, 2012
MBIA Corp [Member]
Dec. 31, 2011
MBIA Corp [Member]
Sep. 30, 2012
National [Member]
Dec. 31, 2011
National [Member]
Dec. 31, 2010
National [Member]
Sep. 30, 2012
MBIA Inc. [Member]
Dec. 31, 2011
MBIA Inc. [Member]
Sep. 30, 2012
MBIA Inc General Corporate Purposes [Member]
Dec. 31, 2011
MBIA Inc General Corporate Purposes [Member]
Sep. 30, 2012
MBIA Inc Total [Member]
Dec. 31, 2011
MBIA Inc Total [Member]
Sep. 30, 2012
Maximum Amount [Member]
Sep. 30, 2012
Utilized Amount [Member]
MBIA Inc. [Member]
Sep. 30, 2012
October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member]
Sep. 30, 2012
October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member]
MBIA Corp [Member]
Sep. 30, 2012
Asset Swap [Member]
MBIA Inc. [Member]
Sep. 30, 2012
Asset/Liability Products [Member]
Dec. 31, 2011
Asset/Liability Products [Member]
Sep. 30, 2012
Asset/Liability Products [Member]
MBIA Inc. [Member]
Dec. 31, 2011
Asset/Liability Products [Member]
MBIA Inc. [Member]
Sep. 30, 2012
CMBS Pool Insured Gross Par [Member]
Sep. 30, 2012
CRE CDO [Member]
Sep. 30, 2012
CRE Loan Pools [Member]
Sep. 30, 2012
CMBS Pool And CRE CDO Gross Par Exposure Decrease Since 2007 [Member]
Sep. 30, 2012
ABS CDO [Member]
Sep. 30, 2012
ABS CDO Gross Par Exposure Decrease Since 2007 [Member]
Sep. 30, 2012
Fair Value Of The Collateral Pledged By MBIA Inc [Member]
Sep. 30, 2012
Net Average Interest Rate [Member]
Sep. 30, 2011
Net Average Interest Rate [Member]
Sep. 30, 2012
Fair Value Of Collateral Pledged By National [Member]
Asset Swap [Member]
Sep. 30, 2012
Notional Amount Utilized [Member]
Dec. 31, 2008
Maximum Amount At Inception [Member]
Sep. 30, 2012
Maximum Amount At Inception [Member]
MBIA Corp [Member]
Sep. 30, 2012
Interest Rate [Member]
MBIA Corp [Member]
Sep. 30, 2012
Borrowing Limit [Member]
Sep. 30, 2012
Consolidated VIEs [Member]
October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member]
MBIA Corp [Member]
Sep. 30, 2012
Second-Lien RMBS Securitizations [Member]
October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member]
Business Acquisition [Line Items]                                                                                    
Liquid asset           $ 386,000,000 $ 534,000,000 $ 318,000,000 $ 703,000,000   $ 432,000,000 $ 386,000,000 $ 335,000,000 $ 226,000,000 $ 432,000,000 $ 386,000,000           $ 97,000,000 $ 160,000,000 $ 97,000,000 $ 160,000,000                                  
Claims payments           1,000,000,000                                                                        
Commuted gross insured exposure         12,800,000,000 13,000,000,000                                                                        
Percentage of recognized estimated recoveries in relationship to consolidated total shareholders equity 82.00% 82.00%   119.00%                                                                            
Federal statutory rate   35.00% 35.00% 35.00%                                                                            
Percentage of ineligible mortgage loan recoveries of statutory capital 144.00% 144.00%   89.00%                                                                            
Estimated insurance recoveries, after income taxes 2,100,000,000 2,100,000,000   2,000,000,000                                                                            
Insurance par exposure 33,100,000,000 33,100,000,000                                               15,700,000,000 2,200,000,000 2,800,000,000 36,100,000,000 4,400,000,000 32,900,000,000                      
Shareholders equity 2,565,000,000 2,565,000,000   1,700,000,000                                                                            
Statutory capital           1,500,000,000   3,100,000,000                                                                    
Contingency reserve release to surplus 196,000,000 196,000,000                                                                                
Qualifying asset shortfall 97,000,000 97,000,000                                                                                
Aggregate risk limits exceeded under NYIL   47,000,000                                                                                
National Secured Loan               1,100,000,000                                                                    
MBIA Secured Loan, average interest rate               7.00%                                                             2.51%      
MBIA Corp Secured Loan               1,600,000,000                                                           2,000,000,000        
Additional borrowing under National Secured Loan               443,000,000                                                                    
Fair value of collateral pledged                                         558,000,000                           535,000,000              
National Asset Swap                     2,000,000,000                                                 522,000,000            
National asset swap, percentage                                                                 0.56% 0.34%                
Secured loan balance                                                                         2,000,000,000          
Approved secured loan maximum outstanding amount 450,000,000 450,000,000                                                                           450,000,000    
Conduit Repurchase Agreement                                 1,000,000,000 51,000,000                           63,000,000                    
Conduit Repurchase Agreement, percentage                                                                 2.48%                  
Payment on tax agreement related to estimated taxes   95,000,000             11,000,000 1,000,000                                                                
Escrow through tax years 365,000,000 365,000,000                                                                                
Invested assets at amortized cost to liabilities at amortized cost issued to third-parties and affiliates at amortized cost 980,000,000 980,000,000   591,000,000                                                                            
Description of sensitivity range The table presents hypothetical increases and decreases in credit spreads of 50 and 200 basis points                                                                                  
Cash payments for second lien RMBS securitizations and CDS contracts                                       11,600,000,000                                         893,000,000  
Cash payments for second lien RMBS securitization                                                                                   6,600,000,000
Gross settlement and claim payments                                     5,000,000,000                                              
Excess interest cash flows from securitizations   185,000,000                                                                                
Ineligible mortgage loans from securitizations, related expected recoveries 3,200,000,000 3,200,000,000                                                                                
Held cash and available-for-sale investments           1,400,000,000 1,500,000,000                                                                      
Cash and short-term investments               $ 356,000,000 $ 771,000,000