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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, 2016 | Mar. 31, 2015
Accounts Notes And Loans Receivable [Line Items] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | $ (69) | $ 30
Non Variable Interest Entity [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | (69) | 30
Variable Interest Entity [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | (1) | (10)
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 | 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] | 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] | (85) | (17)
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) | (58)
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] | (5) | 17
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] | $ 166 | $ 89
[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.

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