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Variable Interest Entities (Tables) | 9 Months Ended
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Sep. 30, 2012
Summary Of Nonconsolidated VIEs Assets And Liabilities |
|  | September 30, 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 |  | $ | 17,552 |  |  | $ | 11,053 |  |  | $ | - |  |  | $ | 67 |  |  | $ | 3 |  |  | $ | 59 |  |  | $ | 78 |  |  | $ | 85 |
Mortgage-backed residential |  |  | 36,464 |  |  |  | 13,578 |  |  |  | 9 |  |  |  | 75 |  |  |  | 2,967 |  |  |  | 73 |  |  |  | 485 |  |  |  | 4 |
Mortgage-backed commercial |  |  | 4,751 |  |  |  | 2,456 |  |  |  | - |  |  |  | 2 |  |  |  | - |  |  |  | 2 |  |  |  | - |  |  |  | - |
Consumer asset-backed |  |  | 6,372 |  |  |  | 3,390 |  |  |  | 11 |  |  |  | 20 |  |  |  | - |  |  |  | 20 |  |  |  | 16 |  |  |  | - |
Corporate asset-backed |  |  | 22,006 |  |  |  | 11,261 |  |  |  | - |  |  |  | 144 |  |  |  | 21 |  |  |  | 159 |  |  |  | - |  |  |  | 1 |
Total global structured finance |  |  | 87,145 |  |  |  | 41,738 |  |  |  | 20 |  |  |  | 308 |  |  |  | 2,991 |  |  |  | 313 |  |  |  | 579 |  |  |  | 90 |
Global public finance |  |  | 46,795 |  |  |  | 21,578 |  |  |  | - |  |  |  | 216 |  |  |  | - |  |  |  | 268 |  |  |  | - |  |  |  | - |
Total insurance |  | $ | 133,940 |  |  | $ | 63,316 |  |  | $ | 20 |  |  | $ | 524 |  |  | $ | 2,991 |  |  | $ | 581 |  |  | $ | 579 |  |  | $ | 90 |
(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