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Variable Interest Entities (Tables) | 6 Months Ended
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Jun. 30, 2012
Summary Of Nonconsolidated VIEs Assets And Liabilities | The nature of the Company’s variable interests in nonconsolidated VIEs is related to financial guarantees, insured CDS contracts and any investments in obligations issued by nonconsolidated VIEs.
|  | June 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 |  | $ | 20,373 |  |  | $ | 11,539 |  |  | $ | 1 |  |  | $ | 61 |  |  | $ |  | - |  | $ | 54 |  |  | $ | 2 |  |  | $ | 108 |
Mortgage-backed residential |  |  | 38,287 |  |  |  | 14,093 |  |  |  | 11 |  |  |  | 80 |  |  |  | 2,925 |  |  |  | 79 |  |  |  | 408 |  |  |  | 5 |
Mortgage-backed commercial |  |  | 4,784 |  |  |  | 2,493 |  |  |  | - |  |  |  | 2 |  |  |  | - |  |  |  | 2 |  |  |  | - |  |  |  | - |
Consumer asset-backed |  |  | 6,584 |  |  |  | 3,668 |  |  |  | 11 |  |  |  | 21 |  |  |  | - |  |  |  | 21 |  |  |  | 18 |  |  |  | - |
Corporate asset-backed |  |  | 24,913 |  |  |  | 12,522 |  |  |  | - |  |  |  | 155 |  |  |  | 21 |  |  |  | 168 |  |  |  | - |  |  |  | 1 |
Total global structured finance |  |  | 94,941 |  |  |  | 44,315 |  |  |  | 23 |  |  |  | 319 |  |  |  | 2,946 |  |  |  | 324 |  |  |  | 428 |  |  |  | 114 |
Global public finance |  |  | 43,097 |  |  |  | 21,195 |  |  |  | - |  |  |  | 212 |  |  |  | - |  |  |  | 265 |  |  |  | - |  |  |  | - |
Total insurance |  | $ | 138,038 |  |  | $ | 65,510 |  |  | $ | 23 |  |  | $ | 531 |  |  | $ | 2,946 |  |  | $ | 589 |  |  | $ | 428 |  |  | $ | 114 |
(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
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Period Type: | duration