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Variable Interest Entities (Summary Of Maximum Exposure To Loss For Nonconsolidated VIEs) (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Collateralized Debt Obligations [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | $ 27,830 |  | $ 30,628 |
Maximum Exposure to Loss | 15,690 |  | 18,068 |
Investments | 61 | [1] | 126 | [1]
Premiums Receivable | 66 | [2] | 78 | [2]
Unearned Premium Revenue | 57 | [3] | 68 |
Derivative Liabilities | 122 | [4] | 360 | [4]
Residential Mortgage-Backed Securities [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | 49,725 |  | 56,828 |
Maximum Exposure to Loss | 16,537 |  | 18,494 |
Investments | 63 | [1] | 71 | [1]
Premiums Receivable | 88 | [2] | 95 | [2]
Insurance Loss Recoverable | 2,505 | [5] | 2,270 | [5]
Unearned Premium Revenue | 87 | [3] | 93 |
Loss and Loss Adjustment Expense Reserves | 469 | [6] | 598 | [6]
Derivative Liabilities | 4 | [4] | 3 | [4]
Commercial Mortgage-Backed [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | 5,293 |  | 5,547 |
Maximum Exposure to Loss | 2,906 |  | 3,138 |
Premiums Receivable | 2 | [2] | 2 | [2]
Unearned Premium Revenue | 2 | [3] | 2 |
Consumer Asset-Backed [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | 8,396 |  | 11,709 |
Maximum Exposure to Loss | 4,854 |  | 6,780 |
Investments | 17 | [1] | 19 | [1]
Premiums Receivable | 27 | [2] | 30 | [2]
Unearned Premium Revenue | 26 | [3] | 29 |
Loss and Loss Adjustment Expense Reserves | 30 | [6] |  |
Corporate Asset-Backed [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | 30,640 |  | 42,380 |
Maximum Exposure to Loss | 16,235 |  | 22,468 |
Investments | 245 | [1] | 246 | [1]
Premiums Receivable | 209 | [2] | 325 | [2]
Insurance Loss Recoverable | 27 | [5] | 5 | [5]
Unearned Premium Revenue | 224 | [3] | 340 |
Derivative Liabilities | 1 | [4] |  |
Global Structured Finance [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | 121,884 |  | 147,092 |
Maximum Exposure to Loss | 56,222 |  | 68,948 |
Investments | 386 | [1] | 462 | [1]
Premiums Receivable | 392 | [2] | 530 | [2]
Insurance Loss Recoverable | 2,532 | [5] | 2,275 | [5]
Unearned Premium Revenue | 396 | [3] | 532 |
Loss and Loss Adjustment Expense Reserves | 499 | [6] | 598 | [6]
Derivative Liabilities | 127 | [4] | 363 | [4]
Global Public Finance [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | 41,272 |  | 42,370 |
Maximum Exposure to Loss | 21,879 |  | 21,201 |
Premiums Receivable | 211 | [2] | 225 | [2]
Unearned Premium Revenue | 265 | [3] | 280 |
Total Insurance [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
VIEs Assets | 163,156 |  | 189,462 |
Maximum Exposure to Loss | 78,101 |  | 90,149 |
Investments | 386 | [1] | 462 | [1]
Premiums Receivable | 603 | [2] | 755 | [2]
Insurance Loss Recoverable | 2,532 | [5] | 2,275 | [5]
Unearned Premium Revenue | 661 | [3] | 812 |
Loss and Loss Adjustment Expense Reserves | 499 | [6] | 598 | [6]
Derivative Liabilities | $ 127 | [4] | $ 363 | [4]
[1] | Reported within "Investments" on MBIA's consolidated balance sheets.
[2] | Reported within "Premiums receivable" on MBIA's consolidated balance sheets.
[3] | Reported within "Unearned premium revenue" on MBIA's consolidated balance sheets.
[4] | Reported within "Derivative liabilities" on MBIA's consolidated balance sheets.
[5] | Reported within "Insurance loss recoverable" on MBIA's consolidated balance sheets.
[6] | Reported within "Loss and loss adjustment expense reserves" on MBIA's consolidated balance sheets.

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