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Fair Value Of Financial Instruments (Changes In Fair Value Included In the Company's Consolidated Income Statement) (Details) (USD $) In Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Net gains (losses) on financial instruments at fair value and foreign exchange | $ (103) |  | $ (2) |  | $ (127) |  | $ (48) |
Realized Investment Gains Losses | (19) | [1] | (14) | [1] | 4 | [1] | (44) | [1]
Loan Repurchase Commitments [Member] |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 39 |  | 77 |  | 70 |  | 293 |
Realized Investment Gains Losses |  |  |  |  |  |  | 63 |
Total Changes in Fair Value | 39 |  | 77 |  | 70 |  | 356 |
Fixed Maturity Securities Held At Fair Value [Member] |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (265) |  | 231 |  | (52) |  | 248 |
Realized Investment Gains Losses |  |  |  |  |  |  | 21 |
Total Changes in Fair Value | (265) |  | 231 |  | (52) |  | 269 |
Other Loans [Member] |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (35) |  | 44 |  | 7 |  | 18 |
Realized Investment Gains Losses |  |  |  |  |  |  |  |
Total Changes in Fair Value | (35) |  | 44 |  | 7 |  | 18 |
Residential Mortgage Loans [Member] |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 29 |  | 130 |  | 130 |  | 368 |
Realized Investment Gains Losses |  |  |  |  |  |  | 220 |
Total Changes in Fair Value | 29 |  | 130 |  | 130 |  | 588 |
Other Assets [Member] |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 18 |  | (2) |  | (22) |  | (1) |
Realized Investment Gains Losses |  |  |  |  |  |  | 159 |
Total Changes in Fair Value | 18 |  | (2) |  | (22) |  | 158 |
Long-term Debt [Member] |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 252 |  | (123) |  | (115) |  | (424) |
Realized Investment Gains Losses |  |  |  |  |  |  | (333) |
Total Changes in Fair Value | $ 252 |  | $ (123) |  | $ (115) |  | $ (757) |
[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.

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- Definition Change in the fair value of and realized gains and losses on financial instruments and foreign exchange included in earnings. + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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