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Investment Income And Gains And Losses (Tables) | 12 Months Ended
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Dec. 31, 2011
Investment Income And Gains And Losses [Abstract] |
Total Investment Income From All Operations |
|  | Years ended December 31, |
In millions |  | 2011 |  |  | 2010 |  |  | 2009 |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity |  | $ | 357 |  |  | $ | 407 |  |  | $ | 511 |
Held-to-maturity |  |  | 6 |  |  |  | 7 |  |  |  | 9 |
Short-term investments |  |  | 6 |  |  |  | 22 |  |  |  | 21 |
Other investments |  |  | 19 |  |  |  | 22 |  |  |  | 32 |
Consolidated VIEs |  |  | 69 |  |  |  | 73 |  |  |  | 89 |
Gross investment income |  |  | 457 |  |  |  | 531 |  |  |  | 662 |
Investment expenses |  |  | 4 |  |  |  | 1 |  |  |  | 6 |
Net investment income |  |  | 453 |  |  |  | 530 |  |  |  | 656 |
Realized gains and losses |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity |  |  |  |  |  |  |  |  |  |  |  |
Gains(1) |  |  | 252 |  |  |  | 112 |  |  |  | 160 |
Losses |  |  | (224 | ) |  |  | (112 | ) |  |  | (447 | )
Net |  |  | 28 |  |  |  | — |  |  |  | (287 | )
Other investments |  |  |  |  |  |  |  |  |  |  |  |
Gains |  |  | 12 |  |  |  | — |  |  |  | 28 |
Losses |  |  | (10 | ) |  |  | (1 | ) |  |  | (124 | )
Net |  |  | 2 |  |  |  | (1 | ) |  |  | (96 | )
Consolidated VIEs |  |  |  |  |  |  |  |  |  |  |  |
Gains |  |  | — |  |  |  | — |  |  |  | 12 |
Losses |  |  | — |  |  |  | — |  |  |  | (109 | )
Net |  |  | — |  |  |  | — |  |  |  | (97 | )
Total net realized gains (losses)(2) |  |  | 30 |  |  |  | (1 | ) |  |  | (480 | )
Total investment income |  | $ | 483 |  |  | $ | 529 |  |  | $ | 176 |
(1)—Includes net trading gains of$9 million for the year ended December 31, 2011. (2)—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.
Credit Losses Recognized In Earnings Related To OTTI Losses For Which A Portion Is Recognized In Accumulated Other Comprehensive Income (Loss) |
In millions |  | Years ended December 31, |
Credit Losses Recognized in Earnings Related to Other-Than-Temporary Impairments |  | 2011 |  |  | 2010 |  |  | 2009 |
Beginning Balance |  | $ | 262 |  |  | $ | 389 |  |  | $ | — |
Credit losses recognized in retained earnings related to the adoption of accounting principles effective April 1, 2009(1) |  |  | — |  |  |  | — |  |  |  | 226 |
Accounting transition adjustment(2) |  |  | — |  |  |  | (149) |  |  |  | — |
Additions for credit loss impairments recognized in the current period on securities not previously impaired |  |  | 63 |  |  |  | 24 |  |  |  | 241 |
Additions for credit loss impairments recognized in the current period on securities previously impaired |  |  | 31 |  |  |  | 18 |  |  |  | 14 |
Additions for credit loss impairments recognized in prior periods for securities that were re-impaired with a non-credit component in the current period |  |  | — |  |  |  | 1 |  |  |  | 13 |
Reductions for credit loss impairments previously recognized on securities sold during the period |  |  | (15) |  |  |  | (16) |  |  |  | (102) |
Reductions for credit loss impairments previously recognized on securities impaired to fair value during the period(3) |  |  | — |  |  |  | (4) |  |  |  | — |
Reductions for increases in cash flows expected to be collected over the remaining life of the security |  |  | — |  |  |  | (1) |  |  |  | (3) |
Ending Balance |  | $ | 341 |  |  | $ | 262 |  |  | $ | 389 |
(1)—Reflects the adoption of the accounting principles for recognition of other-than-temporary impairments. (2)—Reflects the adoption of the accounting principles for the consolidation of VIEs. (3)—Represents circumstances where the Company determined in the current period that it intends to sell the security or it is more likely than not that it will be required to sell the security before recovery of the security's amortized cost.
Significant Inputs Used In Measurement Of Credit Loss Component Recognized In Earnings For Each Significant Class Of ABS |
|  | Years ended December 31, |
Asset-backed Securities |  | 2011 |  |  | 2010 |  |  | 2009 |
Expected size of losses(1): |  |  |  |  |  |  |  |  |  |  |  |
Range(2) |  |  | 2.48% to 100.00% |  |  |  | 0.21% to 100.00% |  |  |  | 0.00% to 100.00% |
Weighted average(3) |  |  | 55.40 | % |  |  | 52.20 | % |  |  | 38.44 | %
Current subordination levels(4): |  |  |  |  |  |  |  |  |  |  |  |
Range(2) |  |  | 0.00% to 35.46% |  |  |  | 0.00% to 42.16% |  |  |  | 0.00% to 48.68% |
Weighted average(3) |  |  | 1.53 | % |  |  | 4.50 | % |  |  | 9.75 | %
Prepayment speed (annual CPR)(5): |  |  |  |  |  |  |  |  |  |  |  |
Range(2) |  |  | 0.00 to 100.00 |  |  |  | 0.00 to 40.20 |  |  |  | 0.00 to 36.20 |
Weighted average(3) |  |  | 12.67 |  |  |  | 9.45 |  |  |  | 6.98 |
(1)—Represents future expected credit losses on impaired assets expressed as a percentage of total outstanding balance. (2)—Represents the range of inputs/assumptions based upon the individual securities within each category. (3)—Calculated by weighting the relevant input/assumption for each individual security by the outstanding notional of the security. (4)—Represents current level of credit protection (subordination) for the securities, expressed as a percentage of the balance of the collateral group backing the bond. (5)—Values represent high and low points of lifetime vectors of constant prepayment rates.
Net Unrealized Gains (Losses), Including Portion Of Other-Than-Temporary Impairments Included In Other Comprehensive Loss, Reported Within Shareholders' Equity |
|  | As of December 31, |
In millions |  | 2011 |  |  | 2010 |
Fixed-maturity: |  |  |  |  |  |  |  |
Gains |  | $ | 262 |  |  | $ | 208 |
Losses |  |  | (459 | ) |  |  | (782 | )
Foreign exchange |  |  | (5 | ) |  |  | (14 | )
Net |  |  | (202 | ) |  |  | (588 | )
Other investments: |  |  |  |  |  |  |  |
Gains |  |  | 1 |  |  |  | 10 |
Losses |  |  | (19 | ) |  |  | (22 | )
Net |  |  | (18 | ) |  |  | (12 | )
Total |  |  | (220 | ) |  |  | (600 | )
Deferred income tax provision (benefit) |  |  | (86 | ) |  |  | (208 | )
Unrealized gains (losses), net |  | $ | (134 | ) |  | $ | (392 | )
Change In Net Unrealized Gains (Losses) |
|  | As of December 31, |
In millions |  | 2011 |  |  | 2010 |
Fixed-maturity |  | $ | 386 |  |  | $ | 749 |
Other investments |  |  | (6 | ) |  |  | 47 |
Total |  |  | 380 |  |  |  | 796 |
Deferred income tax charged (credited) |  |  | 122 |  |  |  | 213 |
Change in unrealized gains (losses), net(1) |  | $ | 258 |  |  | $ | 583 |
(1)—The annual change as of December 31, 2010 included $266 million of net unrealized gains due to the transition adjustment for the adoption of the accounting principles for consolidation of VIEs.

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