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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Collateralized Debt Obligations [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | $ 16,925 |  | $ 26,507 |
Maximum Exposure to Loss | 10,873 |  | 15,466 |
Investments |  |  | 42 | [1]
Premiums receivable | 62 | [2] | 67 | [2]
Insurance loss recoverable | 5 | [3] |  |
Unearned Premium Revenue | 55 | [4] | 58 | [4]
Loss and loss adjustment expense reserves | 37 | [5] | 3 | [5]
Derivative liabilities | 74 | [6] | 113 | [6]
Residential Mortgage-Backed Securities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 34,061 |  | 47,669 |
Maximum Exposure to Loss | 13,075 |  | 16,379 |
Investments | 11 | [1] | 25 | [1]
Premiums receivable | 77 | [2] | 87 | [2]
Insurance loss recoverable | 3,278 | [3] | 2,773 | [3]
Unearned Premium Revenue | 75 | [4] | 86 | [4]
Loss and loss adjustment expense reserves | 440 | [5] | 428 | [5]
Derivative liabilities | 4 | [6] | 5 | [6]
Commercial Mortgage-Backed [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 4,801 |  | 5,001 |
Maximum Exposure to Loss | 2,432 |  | 2,644 |
Premiums receivable | 2 | [2] | 2 | [2]
Unearned Premium Revenue | 2 | [4] | 2 | [4]
Consumer Asset-Backed [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 5,820 |  | 8,015 |
Maximum Exposure to Loss | 3,086 |  | 4,563 |
Investments | 10 | [1] | 16 | [1]
Premiums receivable | 19 | [2] | 26 | [2]
Unearned Premium Revenue | 19 | [4] | 25 | [4]
Loss and loss adjustment expense reserves | 21 | [5] | 23 | [5]
Corporate Asset-Backed [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 19,980 |  | 29,855 |
Maximum Exposure to Loss | 9,981 |  | 15,577 |
Investments |  |  | 241 | [1]
Premiums receivable | 123 | [2] | 192 | [2]
Insurance loss recoverable | 13 | [3] | 22 | [3]
Unearned Premium Revenue | 140 | [4] | 205 | [4]
Derivative liabilities |  |  | 1 | [6]
Global Structured Finance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 81,587 |  | 117,047 |
Maximum Exposure to Loss | 39,447 |  | 54,629 |
Investments | 21 | [1] | 324 | [1]
Premiums receivable | 283 | [2] | 374 | [2]
Insurance loss recoverable | 3,296 | [3] | 2,795 | [3]
Unearned Premium Revenue | 291 | [4] | 376 | [4]
Loss and loss adjustment expense reserves | 498 | [5] | 454 | [5]
Derivative liabilities | 78 | [6] | 119 | [6]
Global Public Finance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 39,259 |  | 42,106 |
Maximum Exposure to Loss | 21,346 |  | 21,774 |
Premiums receivable | 220 | [2] | 215 | [2]
Unearned Premium Revenue | 267 | [4] | 270 | [4]
Loss and loss adjustment expense reserves | 4 | [5] |  |
Total Insurance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 120,846 |  | 159,153 |
Maximum Exposure to Loss | 60,793 |  | 76,403 |
Investments | 21 | [1] | 324 | [1]
Premiums receivable | 503 | [2] | 589 | [2]
Insurance loss recoverable | 3,296 | [3] | 2,795 | [3]
Unearned Premium Revenue | 558 | [4] | 646 | [4]
Loss and loss adjustment expense reserves | 502 | [5] | 454 | [5]
Derivative liabilities | $ 78 | [6] | $ 119 | [6]
[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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