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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
Mar. 31, 2018
Mar. 31, 2017
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange $ (9) $ 17
Other net realized gains (losses) (1) 3
Non Variable Interest Entity [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange (9) 17
Other net realized gains (losses) (1) 3
Variable Interest Entity [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange 4 (33)
Other net realized gains (losses) 0 28
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] 0 6
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] (2) 3
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] (6) (8)
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] (21) (72)
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 [1] 11 3
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] (6) [1] (3)
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] 27 45
Variable Interest Entity Notes [Member] | Variable Interest Entity [Member] | Previously reported [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange [3]   (45)
Other Liabilities [Member] | Non Variable Interest Entity [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Other net realized gains (losses) [4] $ (2) $ 0
[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.
[3]
The Company revised its previously reported amount of a loss of $(45) million to a gain of $45 million.
[4]
Reported within "Other net realized gains (losses)" on MBIA's consolidated statements of operations.