XML 39 R73.htm IDEA: XBRL DOCUMENT ﻿
v2.3.0.11

Investment Income And Gains And Losses (Net Unrealized Gains (Losses), Including Portion Of Other-Than-Temporary Impairments Included In Other Comprehensive Loss, Reported Within Shareholders' Equity) (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Deferred income tax provision (benefit) | $ (103) | $ (208)
Unrealized gains (losses), net | (151) | (392)
Total | (254) | (600)
Fixed-Maturity Investments [Member] |  |
Gains | 225 | 208
Losses | (524) | (782)
Foreign exchange | 49 | (14)
Net | (250) | (588)
Other Investments [Member] |  |
Gains | 4 | 10
Losses | (8) | (22)
Net | $ (4) | $ (12)

X
- Definition Accumulated Other Comprehensive Income Loss Available For Sale Securities Before Tax + Details
Name: | mbi_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeTax
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income Loss Available For Sale Securities Foreign Exchange + Details
Name: | mbi_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesForeignExchange
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income Loss Available For Sale Securities Net Of Tax + Details
Name: | mbi_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesNetOfTax
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income Loss Available For Sale Securities Net Unrealized Gains Losses + Details
Name: | mbi_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesNetUnrealizedGainsLosses
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income Loss Available For Sale Securities Tax + Details
Name: | mbi_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income Loss Available For Sale Securities Unrealized Gains + Details
Name: | mbi_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesUnrealizedGains
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income Loss Available For Sale Securities Unrealized Losses + Details
Name: | mbi_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesUnrealizedLosses
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant