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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | $ 61 |  | $ (6) |  | $ 6 | $ 57
Non Variable Interest Entity [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 61 |  | (6) |  | 6 | 57
Variable Interest Entity [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 23 |  | 78 |  | 26 | 111
Loan Repurchase Commitments [Member] | Variable Interest Entity [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 0 | [1] | 50 | [1] | 5 | 139
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] | 2 | 6
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 | (30) | [1] | (16) | [1] | (68) | 2
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 | (17) | [1] | 145 | [1] | (73) | 71
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 | 0 | [1] | 0 | [1] | 0 | 13
Other Assets [Member] | Variable Interest Entity [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 0 |  | 0 |  | 0 | 0
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) | [2] | (7) | [2] | (14) | (23)
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 | $ 48 |  | $ (160) |  | $ 169 | $ (79)
[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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- Definition Change in the fair value of and realized gains and losses on sale of financial instruments and foreign exchange included in earnings. + References No definition available. + Details
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- Details
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