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Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 31, 2017
Text Block [Abstract] |
Summary Of Nonconsolidated VIEs Assets And Liabilities |
|  |  |  | December 31, 2017
|  |  |  |  |  |  |  |  |  | Carrying Value of Assets |  | Carrying Value of Liabilities
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Loss and Loss
|  |  |  |  |  |  | Maximum |  |  |  |  |  |  |  |  |  | Unearned |  | Adjustment
|  |  |  | VIE |  | Exposure |  |  |  |  | Premiums |  | Insurance Loss |  | Premium |  | Expense
In millions | Assets |  | to Loss |  | Investments(1) |  | Receivable(2) |  | Recoverable(3) |  | Revenue(4) |  | Reserves(5)
Insurance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Global structured finance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Mortgage-backed residential | $ | 7,295 |  | $ | 3,741 |  | $ | 19 |  | $ | 22 |  | $ | 172 |  | $ | 20 |  | $ | 396
|  | Mortgage-backed commercial |  | 216 |  |  | 94 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
|  | Consumer asset-backed |  | 5,010 |  |  | 981 |  |  | - |  |  | 4 |  |  | 1 |  |  | 3 |  |  | 10
|  | Corporate asset-backed |  | 2,418 |  |  | 1,645 |  |  | - |  |  | 13 |  |  | - |  |  | 14 |  |  | -
| Total global structured finance |  | 14,939 |  |  | 6,461 |  |  | 19 |  |  | 39 |  |  | 173 |  |  | 37 |  |  | 406
| Global public finance |  | 15,568 |  |  | 2,524 |  |  | - |  |  | 10 |  |  | - |  |  | 14 |  |  | -
Total insurance | $ | 30,507 |  | $ | 8,985 |  | $ | 19 |  | $ | 49 |  | $ | 173 |  | $ | 51 |  | $ | 406
__________ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(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.
|  |  |  |  | December 31, 2016
|  |  |  |  |  |  |  |  |  |  | Carrying Value of Assets |  | Carrying Value of Liabilities
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Loss and Loss
|  |  |  |  |  |  |  | Maximum |  |  |  |  |  |  |  |  |  | Unearned |  | Adjustment
|  |  |  |  | VIE |  | Exposure |  |  |  |  | Premiums |  | Insurance Loss |  | Premium |  | Expense
In millions |  | Assets |  | to Loss |  | Investments(1) |  | Receivable(2) |  | Recoverable(3) |  | Revenue(4) |  | Reserves(5)
Insurance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Global structured finance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  | $ | 3,167 |  | $ | 1,914 |  | $ | 51 |  | $ | 2 |  | $ | - |  | $ | - |  | $ | 73
|  | Mortgage-backed residential |  |  | 9,146 |  |  | 4,796 |  |  | 20 |  |  | 28 |  |  | 304 |  |  | 27 |  |  | 325
|  | Mortgage-backed commercial |  |  | 257 |  |  | 145 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
|  | Consumer asset-backed |  |  | 4,893 |  |  | 1,331 |  |  | - |  |  | 7 |  |  | 2 |  |  | 5 |  |  | 8
|  | Corporate asset-backed |  |  | 2,625 |  |  | 2,205 |  |  | 5 |  |  | 18 |  |  | - |  |  | 20 |  |  | -
| Total global structured finance |  |  | 20,088 |  |  | 10,391 |  |  | 76 |  |  | 55 |  |  | 306 |  |  | 52 |  |  | 406
| Global public finance |  |  | 44,306 |  |  | 12,051 |  |  | - |  |  | 11 |  |  | - |  |  | 18 |  |  | -
Total insurance |  | $ | 64,394 |  | $ | 22,442 |  | $ | 76 |  | $ | 66 |  | $ | 306 |  | $ | 70 |  | $ | 406
__________ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) - Reported within "Investments" on MBIA's consolidated balance sheets.
(2) - Reported within "Premiums receivable" on MBIA's consolidated balance sheets. Excludes $125 million that is included within “Assets held for sale” on the Company’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. Excludes $134 million that is included within “Liabilities held for sale” on the Company’s consolidated balance sheets.
(5) - Reported within "Loss and loss adjustment expense reserves" on MBIA's consolidated balance sheets.

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