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Fair Value Of Financial Instruments (Gains And Losses On Fair Value Option Included In The Company's Consolidated Statements Of Operations) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange $ 57 $ 5 $ 63 $ 62
Non Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 57 5 63 62
Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 8 [1] 17 [1] 34 [1] 128 [1]
Variable Interest Entity [Member] | Loan Repurchase Commitments [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 1 [1] 1 [1] 6 [1] 140 [1]
Investments Carried At Fair Value [Member] | Non Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange   1 [2] 2 [2] 7 [2]
Fixed Maturity Securities Held At Fair Value - VIE [Member] | Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange (3) [1] (37) [1] (71) [1] (35) [1]
Residential Mortgage Loans [Member] | Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange (45) [1] (87) [1] (118) [1] (16) [1]
Other Loans [Member] | Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange (2) [1]   (2) [1] 13 [1]
Medium Term Notes [Member] | Non Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 15 [2] (17) [2] 1 [2] (39) [2]
Variable Interest Entity Notes [Member] | Variable Interest Entity [Member]
        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange $ 87 [1] $ 164 [1] $ 256 [1] $ 85 [1]
[1]
Reported within Net gains (losses) of financial instruments at fair value and foreign exchange-VIE on MBIA's consolidated statements of operations.
[2]
Reported within Net gains (losses) of financial instruments at fair value and foreign exchange on MBIA's consolidated statements of operations.