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Business Developments, Risks And Uncertainties, And Liquidity (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Apr. 30, 2012
Mar. 31, 2012
MBIA Insurance Corporation [Member]
Dec. 31, 2011
MBIA Insurance Corporation [Member]
Mar. 31, 2012
MBIA Corp [Member]
Dec. 31, 2011
MBIA Corp [Member]
Mar. 31, 2012
MBIA Inc. [Member]
Mar. 31, 2012
MBIA Inc General Corporate Purposes [Member]
Dec. 31, 2011
MBIA Inc General Corporate Purposes [Member]
Dec. 31, 2011
National [Member]
Dec. 31, 2010
National [Member]
Mar. 31, 2012
National [Member]
Mar. 31, 2012
MBIA Inc Total [Member]
Dec. 31, 2011
MBIA Inc Total [Member]
Mar. 31, 2012
Asset/Liability Products [Member]
Dec. 31, 2011
Asset/Liability Products [Member]
Mar. 31, 2012
ABS CDO [Member]
Mar. 31, 2012
CMBS Pool And CRE CDO Gross Par Exposure Decrease Since 2007 [Member]
Mar. 31, 2012
ABS CDO Gross Par Exposure Decrease Since 2007 [Member]
May 10, 2012
CMBS, CRE, CDO, ABS, And Subprime Transactions [Member]
Mar. 31, 2012
Net Average Interest Rate [Member]
Mar. 31, 2011
Net Average Interest Rate [Member]
Mar. 31, 2012
Fair Value Of The Collateral Pledged By MBIA Inc [Member]
Mar. 31, 2012
Interest Rate [Member]
MBIA Corp [Member]
Dec. 31, 2011
Amount Outstanding [Member]
Mar. 31, 2012
Second-Lien RMBS Securitizations [Member]
Mar. 31, 2012
Maximum Amount At Inception [Member]
Dec. 31, 2011
Maximum Amount At Inception [Member]
Mar. 31, 2012
Borrowing Limit [Member]
Mar. 31, 2012
CRE CDO [Member]
Mar. 31, 2012
Notional Amount Utilized [Member]
Mar. 31, 2012
Consolidated VIEs [Member]
MBIA Insurance Corporation [Member]
Mar. 31, 2012
CMBS Pool Insured Gross Par [Member]
Mar. 31, 2012
CRE Loan Pools [Member]
Mar. 31, 2012
Asset Swap [Member]
MBIA Inc. [Member]
Mar. 31, 2012
Asset Swap [Member]
Fair Value Of Collateral Pledged By National [Member]
Mar. 31, 2012
Current Amount Outstanding [Member]
MBIA Corp [Member]
Dec. 31, 2010
Maximum Amount [Member]
Mar. 31, 2012
Utilized Amount [Member]
MBIA Inc. [Member]
Business Acquisition [Line Items]                                                                                
Liquid assets       $ 329,000,000 $ 534,000,000 $ 329,000,000 $ 534,000,000   $ 251,000,000 $ 226,000,000 $ 703,000,000   $ 690,000,000 $ 482,000,000 $ 386,000,000 $ 231,000,000 $ 160,000,000                                              
Claim payments           211,000,000                                                                    
Commuted gross insured exposure           4,300,000,000                             7,200,000,000                                      
Estimated insurance recoveries, after income taxes 2,100,000,000 2,000,000,000                                                                            
Percentage of recognized estimated recoveries in relationship to consolidated total shareholder's equity 111.00% 119.00%                                                                            
Federal statutory rate 35.00% 35.00%                                                                            
Percentage of ineligible mortgage loan recoveries of statutory capital 112.00% 89.00%                                                                            
Insured par exposure                                   6,000,000,000 30,500,000,000 31,300,000,000                     4,300,000,000     19,200,000,000 3,300,000,000          
Total shareholders' equity of MBIA Inc. 1,858,000,000 1,700,000,000                                                                            
Statutory capital       1,900,000,000                 2,900,000,000                                                      
National Secured Loan 1,100,000,000                                                                              
Additional borrowing under national secured loan     443,000,000                                                                          
Fair value of collateral pledged           166,000,000                                                           1,100,000,000 1,000,000,000      
MBIA Corp secured loan                                                       2,000,000,000                   300,000,000    
National Secured Loan, interest rate 7.00%                                                                              
National Asset Swap               2,000,000,000                                               1,000,000,000                
National Asset Swap, percentage                                           0.88% 0.23%                                  
Secured Loan balance                                                   300,000,000     2,000,000,000                      
MBIA Secured Loan, average interest rate                                                 2.53%                              
Conduit Repurchase Agreement                                               63,000,000                             1,000,000,000 55,000,000
Conduit Repurchase Agreement, percentage                                           2.51%                                    
Contingency reserve release to surplus 196,000,000                                                                              
Approved, secured loan maximum outstanding amount 450,000,000                                                         450,000,000                    
Payment on tax agreement related to estimated taxes 23,000,000                   11,000,000 1,000,000                                                        
Escrow through tax years 293,000,000                                                                              
Cash payments for second lien RMBS securitizations and CDS contracts       10,900,000,000                                                         785,000,000              
Cash payment for second lien RMBS securitizations                                                     6,400,000,000                          
Invested assets at amortized cost to liabilities at amortized cost issued to third-parties and affiliates at amortized cost 783,000,000 591,000,000                                                                            
Ineligible mortgage loans from securitizations, related expected recoveries           3,200,000,000                                                                    
Held cash and available-for-sale investments       1,300,000,000 1,500,000,000                                                                      
Cash and available-for-sale investments                     $ 771,000,000   $ 780,000,000