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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 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
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 |  | $ 879 | 876
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 | 2
Accrued investment income | [1] | 37 | 40
Receivable for investments sold | [1] | 52 |
Assets held for sale |  | 0 | 306
Total assets |  | 91 | 348
Long-term debt |  | 1,047 | 1,030
Payable for investments purchased | [2] | 89 | 32
Total liabilities |  | 1,473 | 1,062
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Variable interest entity notes |  | 337 |
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] |  |  |
Total assets |  | 879 | 876
Investment agreements |  | 496 | 508
Medium-term notes |  | 456 | 478
Total liabilities |  | 1,826 | 1,868
Gross |  | 2,499 | 2,638
Ceded |  | 35 | 18
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 |  | 879 | 876
Variable interest entity notes |  | 874 | 882
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 |  | 2 | 3
Accrued investment income | [1] | 37 | 40
Receivable for investments sold | [1] | 52 |
Assets held for sale |  | 0 | 306
Total assets |  | 981 | 1,239
Investment agreements |  | 390 | 399
Medium-term notes |  | 726 | 794
Long-term debt |  | 2,034 | 1,986
Payable for investments purchased | [2] | 89 | 32
Total liabilities |  | 4,450 | 4,101
Gross |  | 986 | 995
Ceded |  | 43 | 43
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 | 890
Variable interest entity notes |  | 1,211 | 890
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 | 2
Accrued investment income | [1] | 37 | 40
Receivable for investments sold | [1] | 52 |
Assets held for sale |  | 0 | 306
Total assets |  | 970 | 1,224
Investment agreements |  | 496 | 508
Medium-term notes |  | 456 | 478
Long-term debt |  | 1,047 | 1,030
Payable for investments purchased | [2] | 89 | 32
Total liabilities |  | 3,299 | 2,930
Gross |  | 2,499 | 2,638
Ceded |  | 35 | 18
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 |  | 879 | 876
Variable interest entity notes |  | $ 1,211 | $ 882
[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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