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Fair Value Of Financial Instruments (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Dec. 31, 2009
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross par outstanding on insured derivatives | $ 91,600,000,000 |  |  | $ 91,600,000,000 |  |  |  |  |  |  |
Financial guarantees, interest payments | 8,725,000,000 | [1] |  | 8,725,000,000 | [1] |  |  | 10,853,000,000 | [1] |  |
Percentage of sector-specific transactions valued using BET model | 7.00% |  |  | 7.00% |  |  |  |  |  |  |
Percentage of transactions valued using corporate spreads used | 48.00% |  |  | 48.00% |  |  |  |  |  |  |
Percentage of transactions valued using spread benchmarked from most relevant spread source | 45.00% |  |  | 45.00% |  |  |  |  |  |  |
Percentage of transactions valued using WARF-sourced and/or ratings sourced credit spread | 91.00% |  |  | 91.00% |  |  |  |  |  |  |
Net insured derivative liabilities | 4,900,000,000 |  |  | 4,900,000,000 |  |  |  | 4,400,000,000 |  |  |
Impact of including nonperformance risk in valuation of pre-tax net insured derivative liability | 9,500,000,000 |  |  | 9,500,000,000 |  |  |  | 12,100,000,000 |  |  |
Level 3 analysis, assets | 4,309,000,000 |  | 4,651,000,000 | 4,309,000,000 |  | 4,651,000,000 | 4,528,000,000 | 4,467,000,000 |  | 5,270,000,000 | 1,627,000,000
Level 3 analysis, liabilities | 8,919,000,000 |  | 10,871,000,000 | 8,919,000,000 |  | 10,871,000,000 | 11,307,000,000 | 9,916,000,000 |  | 9,924,000,000 | 3,900,000,000
Transfers into Level 3 | 144,000,000 |  | 323,000,000 | 350,000,000 |  | 720,000,000 |  |  |  |  |
Transfers out of Level 3 | 77,000,000 |  | 126,000,000 | 354,000,000 |  | 511,000,000 |  |  |  |  |
Transfers into Level 2 | 77,000,000 |  | 126,000,000 | 354,000,000 |  | 511,000,000 |  |  |  |  |
Transfers out of Level 2 | 144,000,000 |  | 323,000,000 | 350,000,000 |  | 720,000,000 |  |  |  |  |
Transfers in or out of Level 1 | 0 |  |  | 0 |  |  |  | 0 |  |  |
Net unrealized losses related to the transfers into level 3 | 5,000,000 |  |  | 5,000,000 |  | 13,000,000 |  |  |  |  |
Net unrealized gains related to transfers into Level 3 |  |  | 15,000,000 |  |  |  |  |  |  |  |
Net unrealized gains related to the transfers out of level 3 | 11,000,000 |  | 1,000 | 33,000,000 |  | 45,000,000 |  |  |  |  |
Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross par outstanding on insured derivatives | 7,400,000,000 |  |  | 7,400,000,000 |  |  |  |  |  |  |
Required Payment Of Lost Principal [Member] | CDS Contracts [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross par outstanding on insured derivatives | 65,500,000,000 |  |  | 65,500,000,000 |  |  |  |  |  |  |
Required Interest Payments [Member] | CDS Contracts [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross par outstanding on insured derivatives | 18,700,000,000 |  |  | 18,700,000,000 |  |  |  |  |  |  |
BET Valuation Model [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of insured credit derivatives fair valued using the BET model | 81.00% |  |  | 81.00% |  |  |  |  |  |  |
Direct Price Model [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of insured credit derivatives value under direct price model | 19.00% |  |  | 19.00% |  |  |  |  |  |  |
Corporate CDO [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross par outstanding on insured derivatives | 4,400,000,000 |  |  | 4,400,000,000 |  |  |  |  |  |  |
CDS Contracts [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross par outstanding on insured derivatives | 84,200,000,000 |  |  | 84,200,000,000 |  |  |  |  |  |  |
CMBS and Commercial Mortgage Collateral [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross par outstanding on insured derivatives | $ 35,300,000,000 |  |  | $ 35,300,000,000 |  |  |  |  |  |  |
[1] | Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition This element represents the amount of insured contractual payments outstanding attributable to interest accrued on the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 163 -Section Appendix A -Paragraph A13 -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 -Number 163 -Paragraph 31 -Subparagraph a(3) -Name Statement of Financial Accounting Standard (FAS) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(iii) -URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288 + Details
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