XML 13 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.8

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.

X
- 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
Name: | mbi_NetGainsLossesOnFinancialInstrumentsAtFairValueAndForeignExchange
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration