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Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary Of Nonconsolidated VIEs Assets And Liabilities |
|  | December 31, 2012 |
|  |  |  |  |  |  |  | Carrying Value of Assets |  |  | Carrying Value of Liabilities |
In millions |  | VIE Assets |  |  | Maximum Exposure to Loss |  |  | Investments(1) |  |  | Premiums Receivable(2) |  |  | Insurance Loss Recoverable(3) |  |  | Unearned Premium Revenue(4) |  |  | Loss and Loss Adjustment Expense Reserves(5) |  |  | Derivative Liabilities(6) |
Insurance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Global structured finance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  | $ | 16,925 |  |  | $ | 10,873 |  |  | $ | — |  |  | $ | 62 |  |  | $ | 5 |  |  | $ | 55 |  |  | $ | 37 |  |  | $ | 74 |
Mortgage-backed residential |  |  | 34,061 |  |  |  | 13,075 |  |  |  | 11 |  |  |  | 77 |  |  |  | 3,278 |  |  |  | 75 |  |  |  | 440 |  |  |  | 4 |
Mortgage-backed commercial |  |  | 4,801 |  |  |  | 2,432 |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | — |
Consumer asset-backed |  |  | 5,820 |  |  |  | 3,086 |  |  |  | 10 |  |  |  | 19 |  |  |  | — |  |  |  | 19 |  |  |  | 21 |  |  |  | — |
Corporate asset-backed |  |  | 19,980 |  |  |  | 9,981 |  |  |  | — |  |  |  | 123 |  |  |  | 13 |  |  |  | 140 |  |  |  | — |  |  |  | — |
Total global structured finance |  |  | 81,587 |  |  |  | 39,447 |  |  |  | 21 |  |  |  | 283 |  |  |  | 3,296 |  |  |  | 291 |  |  |  | 498 |  |  |  | 78 |
Global public finance |  |  | 39,259 |  |  |  | 21,346 |  |  |  | — |  |  |  | 220 |  |  |  | — |  |  |  | 267 |  |  |  | 4 |  |  |  | — |
Total insurance |  | $ | 120,846 |  |  | $ | 60,793 |  |  | $ | 21 |  |  | $ | 503 |  |  | $ | 3,296 |  |  | $ | 558 |  |  | $ | 502 |  |  | $ | 78 |
(1)—Reported within “Investments” on MBIA’s consolidated balance sheets. (2)—Reported within “Premiums receivable” on MBIA’s consolidated balance sheets. (3)—Reported within “Insurance loss recoverable” on MBIA’s consolidated balance sheets. (4)—Reported within “Unearned premium revenue” on MBIA’s consolidated balance sheets. (5)—Reported within “Loss and loss adjustment expense reserves” on MBIA’s consolidated balance sheets. (6)—Reported within “Derivative liabilities” on MBIA’s consolidated balance sheets.
|  | December 31, 2011 |
|  |  |  |  |  |  |  | Carrying Value of Assets |  |  | Carrying Value of Liabilities |
In millions |  | VIE Assets |  |  | Maximum Exposure to Loss |  |  | Investments(1) |  |  | Premiums Receivable(2) |  |  | Insurance Loss Recoverable(3) |  |  | Unearned Premium Revenue(4) |  |  | Loss and Loss Adjustment Expense Reserves(5) |  |  | Derivative Liabilities(6) |
Insurance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Global structured finance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  | $ | 26,507 |  |  | $ | 15,466 |  |  | $ | 42 |  |  | $ | 67 |  |  | $ | — |  |  | $ | 58 |  |  | $ | 3 |  |  | $ | 113 |
Mortgage-backed residential |  |  | 47,669 |  |  |  | 16,379 |  |  |  | 25 |  |  |  | 87 |  |  |  | 2,773 |  |  |  | 86 |  |  |  | 428 |  |  |  | 5 |
Mortgage-backed commercial |  |  | 5,001 |  |  |  | 2,644 |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | — |
Consumer asset-backed |  |  | 8,015 |  |  |  | 4,563 |  |  |  | 16 |  |  |  | 26 |  |  |  | — |  |  |  | 25 |  |  |  | 23 |  |  |  | — |
Corporate asset-backed |  |  | 29,855 |  |  |  | 15,577 |  |  |  | 241 |  |  |  | 192 |  |  |  | 22 |  |  |  | 205 |  |  |  | — |  |  |  | 1 |
Total global structured finance |  |  | 117,047 |  |  |  | 54,629 |  |  |  | 324 |  |  |  | 374 |  |  |  | 2,795 |  |  |  | 376 |  |  |  | 454 |  |  |  | 119 |
Global public finance |  |  | 42,106 |  |  |  | 21,774 |  |  |  | — |  |  |  | 215 |  |  |  | — |  |  |  | 270 |  |  |  | — |  |  |  | — |
Total insurance |  | $ | 159,153 |  |  | $ | 76,403 |  |  | $ | 324 |  |  | $ | 589 |  |  | $ | 2,795 |  |  | $ | 646 |  |  | $ | 454 |  |  | $ | 119 |
(1)—Reported within “Investments” on MBIA’s consolidated balance sheets. (2)—Reported within “Premiums receivable” on MBIA’s consolidated balance sheets. (3)—Reported within “Insurance loss recoverable” on MBIA’s consolidated balance sheets. (4)—Reported within “Unearned premium revenue” on MBIA’s consolidated balance sheets. (5)—Reported within “Loss and loss adjustment expense reserves” on MBIA’s consolidated balance sheets. (6)—Reported within “Derivative liabilities” on MBIA’s consolidated balance sheets.

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- Definition Schedule Of Summary Of Nonconsolidated VIEs Assets And Liabilities [Text Block] + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration