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Investment Income And Gains And Losses (Total Investment Income From All Operations) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |
Gross investment income | $ 457 |  | $ 531 |  | $ 662 |
Investment expenses | 4 |  | 1 |  | 6 |
Net investment income | 453 |  | 530 |  | 656 |
Total net realized gains (losses) | 30 | [1] | (1) | [1] | (480) | [1]
Total investment income | 483 |  | 529 |  | 176 |
Realized gains on trading securities | 9 |  |  |  |  |
Fixed-Maturity Investments [Member] |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |
Gross investment income | 357 |  | 407 |  | 511 |
Gains | 252 | [2] | 112 | [2] | 160 | [2]
Losses | (224) |  | (112) |  | (447) |
Total net realized gains (losses) | 28 |  |  |  | (287) |
Held-To-Maturity [Member] |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |
Gross investment income | 6 |  | 7 |  | 9 |
Other Long Term Investments [Member] |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |
Gross investment income | 19 |  | 22 |  | 32 |
Gains | 12 |  |  |  | 28 |
Losses | (10) |  | (1) |  | (124) |
Total net realized gains (losses) | 2 |  | (1) |  | (96) |
Variable Interest Entities [Member] |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |
Gross investment income | 69 |  | 73 |  | 89 |
Gains |  |  |  |  | 12 |
Losses |  |  |  |  | (109) |
Total net realized gains (losses) |  |  |  |  | (97) |
Short-Term Investments [Member] |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |
Gross investment income | $ 6 |  | $ 22 |  | $ 21 |
[1] | These balances are included in the "Net gains (losses) on financial instruments at fair value and foreign exchange" and "Net investment losses related to other-than-temporary impairments" line items on MBIA's consolidated statements of operations.
[2] | Includes net trading gains of$9 million for the year ended December 31, 2011.

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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a -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 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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- Definition Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -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 SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 7 -Subparagraph a, b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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