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Business Developments and Risks and Uncertainties (Tables) | 12 Months Ended
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Dec. 31, 2016
Text Block [Abstract] |
Fair Value Of Subsidiary Sold |
|  |  |  | As of |  |
| In millions |  | December 31, 2016 |  |
| Fair Value of MBIA UK |  |  |  |  |
| Total expected consideration for sale of MBIA UK |  | $ | 306 | (1) |
| Costs to sell |  |  | (8) |  |
|  | Net fair value of MBIA UK, less costs to sell |  | $ | 298 |  |
| __________ |  |  |  |  |
| (1) - Amount includes the fair value of the Zohar II Notes received from the sale of MBIA UK less the cash payment of $23 million to Assured. |  |
Pre-Tax Loss On Sale Of Subsidiary |
|  |  |  | As of |  |
| In millions |  | December 31, 2016 |  |
| Pre-tax loss on disposal of MBIA UK |  |  |  |  |
| Difference between the carrying value and the fair value of MBIA UK |  | $ | (270) | (1) |
| Costs to sell |  |  | (8) |  |
|  | Total pre-tax loss on adjusting MBIA UK to its fair value less costs to sell |  | $ | (278) |  |
| __________ |  |  |  |  |
| (1) - Includes $97 million of losses related to items that continue to be included in accumulated other comprehensive income (loss) until ultimate sale. |  |
Assets And Liabilities Held For Sale |
|  |  |  |  | As of |
| In millions |  | December 31, 2016 |
| Assets |  |  |  |
|  | Investments |  | $ | 466 |
|  | Cash and cash equivalents |  |  | 73 |
|  | Premiums receivable |  |  | 267 |
|  | Other assets |  |  | 19 |
|  | Valuation allowance |  |  | (270) |
|  | Total assets held for sale |  | $ | 555 |
| Liabilities |  |  |  |
|  | Unearned premium revenue |  | $ | 304 |
|  | Other liabilities |  |  | 42 |
|  | Total liabilities held for sale |  | $ | 346 |

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