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Derivative Instruments (Summary Of Credit Derivatives Sold) (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Insurance Operations [Member] |  |
Total Notional Value of Credit Derivatives | $ 103,003 | $ 112,765
Total Fair Value of Credit Derivatives | (7,268) | (5,830)
Insurance Operations [Member] | Credit Rating AAA [Member] |  |
Total Notional Value of Credit Derivatives | 16,403 | 20,721
Total Fair Value of Credit Derivatives | (56) | (41)
Insurance Operations [Member] | Credit Rating AAA [Member] | Insured Credit Default Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 16,403 | 20,721
Insurance Operations [Member] | Credit Rating AA [Member] |  |
Total Notional Value of Credit Derivatives | 17,687 | 18,851
Total Fair Value of Credit Derivatives | (133) | (86)
Insurance Operations [Member] | Credit Rating AA [Member] | Insured Credit Default Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 17,385 | 18,530
Insurance Operations [Member] | Credit Rating AA [Member] | Insured Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 302 | 321
Insurance Operations [Member] | Credit Rating A [Member] |  |
Total Notional Value of Credit Derivatives | 13,417 | 16,237
Total Fair Value of Credit Derivatives | (175) | (315)
Insurance Operations [Member] | Credit Rating A [Member] | Insured Credit Default Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 9,057 | 11,323
Insurance Operations [Member] | Credit Rating A [Member] | Insured Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 4,360 | 4,801
Insurance Operations [Member] | Credit Rating A [Member] | All Others [Member] |  |
Total Notional Value of Credit Derivatives |  | 113
Insurance Operations [Member] | Credit Rating BBB [Member] |  |
Total Notional Value of Credit Derivatives | 20,446 | 20,096
Total Fair Value of Credit Derivatives | (1,135) | (477)
Insurance Operations [Member] | Credit Rating BBB [Member] | Insured Credit Default Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 17,172 | 15,356
Insurance Operations [Member] | Credit Rating BBB [Member] | Insured Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 3,274 | 4,740
Insurance Operations [Member] | Credit Rating Below BBB [Member] |  |
Total Notional Value of Credit Derivatives | 35,050 | 36,860
Total Fair Value of Credit Derivatives | (5,769) | (4,911)
Insurance Operations [Member] | Credit Rating Below BBB [Member] | Insured Credit Default Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 32,144 | 33,377
Insurance Operations [Member] | Credit Rating Below BBB [Member] | Non-Insured Credit Default Swaps-VIE [Member] |  |
Total Notional Value of Credit Derivatives | 2,558 | 2,612
Insurance Operations [Member] | Credit Rating Below BBB [Member] | Insured Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 153 | 676
Insurance Operations [Member] | Credit Rating Below BBB [Member] | All Others [Member] |  |
Total Notional Value of Credit Derivatives | 195 | 195
Insurance Operations [Member] | Insured Credit Default Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 92,161 | 99,307
Total Fair Value of Credit Derivatives | 5,595 | (4,325)
Weighted average remaining maturity credit derivatives in years | 6.2Y | 7.6Y
Insurance Operations [Member] | Non-Insured Credit Default Swaps-VIE [Member] |  |
Total Notional Value of Credit Derivatives | 2,558 | 2,612
Total Fair Value of Credit Derivatives | 1,590 | (1,455)
Weighted average remaining maturity credit derivatives in years | 4.8Y | 4.8Y
Insurance Operations [Member] | Insured Swaps [Member] |  |
Total Notional Value of Credit Derivatives | 8,089 | 10,538
Total Fair Value of Credit Derivatives | 10 | (11)
Weighted average remaining maturity credit derivatives in years | 18.9Y | 16.6Y
Insurance Operations [Member] | All Others [Member] |  |
Total Notional Value of Credit Derivatives | 195 | 308
Total Fair Value of Credit Derivatives | 73 | (39)
Weighted average remaining maturity credit derivatives in years | 3.3Y | 8.5Y
Asset / Liability Products [Member] |  |
Total Notional Value of Credit Derivatives | 4,995 | 4,237
Total Fair Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating AAA [Member] |  |
Total Notional Value of Credit Derivatives | 4,995 | 4,237
Total Fair Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating AAA [Member] | Principal Protection Guarantees [Member] |  |
Total Notional Value of Credit Derivatives | 4,995 | 4,237
Asset / Liability Products [Member] | Credit Rating AA [Member] |  |
Total Notional Value of Credit Derivatives |  |
Total Fair Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating AA [Member] | Principal Protection Guarantees [Member] |  |
Total Notional Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating A [Member] |  |
Total Notional Value of Credit Derivatives |  |
Total Fair Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating A [Member] | Principal Protection Guarantees [Member] |  |
Total Notional Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating BBB [Member] |  |
Total Notional Value of Credit Derivatives |  |
Total Fair Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating BBB [Member] | Principal Protection Guarantees [Member] |  |
Total Notional Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating Below BBB [Member] |  |
Total Notional Value of Credit Derivatives |  |
Total Fair Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Credit Rating Below BBB [Member] | Principal Protection Guarantees [Member] |  |
Total Notional Value of Credit Derivatives |  |
Asset / Liability Products [Member] | Principal Protection Guarantees [Member] |  |
Total Notional Value of Credit Derivatives | 4,995 | 4,237
Total Fair Value of Credit Derivatives |  |
Weighted average remaining maturity credit derivatives in years | 0.5Y | 1Y

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- Definition Weighted Average Remaining Maturity Credit Derivatives In Years + Details
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Namespace Prefix: | mbi
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Balance Type: | na
Period Type: | instant

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- Definition Fair value as of the balance sheet date of credit risk derivative liabilities, which includes all such derivative instruments in hedging and non-hedging relationships that are recognized as liabilities on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Aggregate notional amount of credit risk derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant