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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
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange $ 14 $ 45 $ (55) $ 75
Non Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 14 45 (55) 75
Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange (7) 6 (8) (4)
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] 2 3 5 9
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 [2] 3   6 1
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 [1] (13) (55) (97) (73)
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 [1] (70) (54) (140) (113)
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 [2] 4 13   31
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 [1] $ 71 $ 72 $ 238 $ 162
[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.