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Fair Value Of Financial Instruments (Fair Value Hierarchy Table Presents The Company's Assets And Liabilities At Fair Value Not Recorded On The Company's Consolidated Balance Sheet) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Assets held for sale |  | $ 555 |
Variable Interest Entity Primary Beneficiary [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Investments held-to-maturity, fair value |  | 876 | $ 2,401
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 1 [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Total assets |  | 0 | 0
Total liabilities |  | 0 | 0
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Other investments |  | 2 |
Accrued investment income | [1] | 40 | 38
Receivable for investments sold | [1] |  | 26
Assets held for sale |  | 306 |
Total assets |  | 348 | 64
Long-term debt |  | 1,030 | 762
Payable for investments purchased | [2] | 32 | 36
Total liabilities |  | 1,062 | 798
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Other investments |  |  | 3
Total assets |  | 876 | 2,404
Investment agreements |  | 508 | 595
Medium-term notes |  | 478 | 534
Total liabilities |  | 1,868 | 3,725
Gross |  | 2,638 | 3,093
Ceded |  | 18 | 94
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Investments held-to-maturity, fair value |  | 876 | 2,401
Variable interest entity notes |  | 882 | 2,596
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Other investments |  | 3 | 3
Accrued investment income | [1] | 40 | 38
Receivable for investments sold | [1] |  | 26
Assets held for sale |  | 306 |
Total assets |  | 1,239 | 2,756
Investment agreements |  | 399 | 462
Medium-term notes |  | 794 | 855
Long-term debt |  | 1,986 | 1,889
Payable for investments purchased | [2] | 32 | 36
Total liabilities |  | 4,101 | 5,931
Gross |  | 995 | 1,530
Ceded |  | 43 | 56
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Investments held-to-maturity, fair value |  | 890 | 2,689
Variable interest entity notes |  | 890 | 2,689
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Other investments |  | 2 | 3
Accrued investment income | [1] | 40 | 38
Receivable for investments sold | [1] |  | 26
Assets held for sale |  | 306 |
Total assets |  | 1,224 | 2,468
Investment agreements |  | 508 | 595
Medium-term notes |  | 478 | 534
Long-term debt |  | 1,030 | 762
Payable for investments purchased | [2] | 32 | 36
Total liabilities |  | 2,930 | 4,523
Gross |  | 2,638 | 3,093
Ceded |  | 18 | 94
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Investments held-to-maturity, fair value |  | 876 | 2,401
Variable interest entity notes |  | $ 882 | $ 2,596
[1] | Reported within "Other assets" on MBIA's consolidated balance sheets.
[2] | Reported within "Other liabilities" on MBIA's consolidated balance sheets.

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- Definition Represents the Company's balance sheet carrying amount of the financial guarantee insurance contracts ceded to third party reinsurers. The balance sheet carrying amount comprises the prepaid reinsurance premiums and reinsurance recoverable on paid and unpaid losses + References No definition available. + Details
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- Definition Represents the Company's balance sheet carrying amount of the financial guarantee insurance contract obligations with third parties. The gross balance sheet carrying amount comprises the unearned premium revenue and the loss and loss adjustment expense reserves balances + References No definition available. + Details
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