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Investments (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  | 6 Months Ended | 12 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2011 Asset-Backed Securities [Member] Asset / Liability Products [Member] | Jun. 30, 2011 Asset / Liability Products [Member] | Jun. 30, 2010 Asset / Liability Products [Member] | Jun. 30, 2011 Asset / Liability Products [Member] | Jun. 30, 2010 Asset / Liability Products [Member] | Jun. 30, 2011 MBIA [Member] Mortgage-backed Securities [Member] National [Member] | Jun. 30, 2011 MBIA [Member] Mortgage-backed Securities [Member] National [Member] 3rd Party Guarantors [Member] | Jun. 30, 2011 MBIA [Member] Asset-Backed Securities [Member] National [Member] 3rd Party Guarantors [Member] | Jun. 30, 2011 MBIA [Member] National [Member] 3rd Party Guarantors [Member] Corporate Obligations [Member] | Jun. 30, 2011 MBIA [Member] National [Member] Corporate Obligations [Member] | Jun. 30, 2011 Book Value Greater Than Market Value By More Than 5% [Member] | Dec. 31, 2010 Book Value Greater Than Market Value By More Than 5% [Member] | Jun. 30, 2011 MBIA [Member] Asset-Backed Securities [Member] | Jun. 30, 2011 Asset-Backed Securities [Member] | Jun. 30, 2011 MBIA [Member] Mortgage-backed Securities [Member] | Jun. 30, 2011 Mortgage-backed Securities [Member] | Jun. 30, 2011 MBIA [Member] Corporate Obligations [Member] | Jun. 30, 2011 Corporate Obligations [Member] | Jun. 30, 2011 Variable Interest Entity, Primary Beneficiary [Member] | Dec. 31, 2010 Variable Interest Entity, Primary Beneficiary [Member] | Jun. 30, 2011 Aggregate Unrealized Losses [Member] | Dec. 31, 2010 Aggregate Unrealized Losses [Member]
Fair value of securities on deposit with various regulatory authorities | $ 11,000,000 |  | $ 11,000,000 |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of securities pledged as collateral | 2,100,000,000 |  | 2,100,000,000 |  | 2,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash pledged as collateral under investment agreements | 7,000,000 |  | 7,000,000 |  |  | 113,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,934,000,000 | 4,039,000,000 |  |
Fair value of held-to-maturity investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,703,000,000 | 3,760,000,000 |  |
Unrecognized gross losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 235,000,000 | 279,000,000 |  |
Unrecognized gross gains | 4,000,000 |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized losses, portfolio | 767,000,000,000 |  | 767,000,000,000 |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized losses, available for sale securities | 532,000,000 |  | 532,000,000 |  | 804,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
12 months or longer, unrealized losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 714,000,000 | 941,000,000
Rate of book value securities exceeded market value | 5.00% |  | 5.00% |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities, unrealized loss position for continuous 12-month period or longer | 349 |  | 349 |  | 412 |  |  |  |  |  |  |  |  |  |  |  | 254 | 321 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average contractual maturity period of securities, unrealized loss position | 21 |  | 21 |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of security impaired at time of review |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of security impaired at time of review, fair value below amortized cost for consecutive 12-month period |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company Investments Percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  | 82.00% |  |  | 91.00% |  |  |  |
Investment Grade Rated with Aaa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.00% |  |  | 57.00% |  |  | 10.00% |  |  |  |
Investments Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 |  |  |  |
Fair value | 4,412,000,000 |  | 4,412,000,000 |  | 6,954,000,000 |  | 596,000,000 |  |  |  |  |  |  |  |  |  |  |  | 332,000,000 | [1] | 698,000,000 | 15,000,000 | [1] | 849,000,000 | 173,000,000 | [1] | 859,000,000 |  |  |  |
Gross unrealized losses | 532,000,000 |  | 532,000,000 |  | 804,000,000 |  | 158,000,000 |  |  |  |  |  |  |  |  |  |  |  | 78,000,000 | [1] | (251,000,000) | 5,000,000 | [1] | (126,000,000) | 13,000,000 | [1] | (73,000,000) |  |  |  |
Other-than-temporary impairments | 20,000,000 | 13,000,000 | 33,000,000 | 43,000,000 |  |  |  | 18,000,000 | 12,000,000 | 29,000,000 | 39,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit of Guarantees Provided |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 | 292,000,000 | 332,000,000 | 56,000,000 | 154,000,000 |  |  |  |  | 93,000,000 |  |  |  |  |  |  |  |  |  |
Securities Rated Below Investment Grade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 158,000,000 |  |  | $ 308,000,000 |  |  | $ 79,000,000 |  |  |  |
Securities Rated Below Investment Grade Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23.00% |  |  | 36.00% |  |  | 9.00% |  |  |  |
[1] | - Includes investments insured by MBIA Corp. and National.

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6226653-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(2) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -Subparagraph b -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=d3e113969-111729 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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