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Debt (Narrative) (Detail) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 20, 2017 | Dec. 31, 2017 | Dec. 31, 2016
MBIA Inc Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 5.70% |
Long-term debt, maturity year |  | 2034 |
MBIA Corp Surplus Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate terms |  | Contractual interest rate is based on the three month LIBOR plus 11.26%. Callable on or after January 15, 2023 and every fifth anniversary thereafter at par. |
Medium Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repurchase of MTNs |  | $ 160 |
Weighted average interest rate |  | 2.90% | 2.43%
Percent of par |  | 84.00% |
Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 5.75% | 5.66%
MBIA Corp Financing Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage | 14.00% |  |
Long-term debt, maturity date |  | Jan. 20, 2020 |
Commitment fees |  | $ 10 |
MBIA Corp Financing Facility [Member] | Initial [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 366 |  |
Proceeds from subordinated financing | $ 38 |  |
MBIA Corp Financing Facility [Member] | Outstanding [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  | 330 |
Mbia Inc [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from subordinated financing |  | 38 |
Mbia Inc [Member] | MBIA Inc Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes owned at par value |  | 54 |
Mbia Inc [Member] | MBIA Corp Surplus Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Surplus notes owned at par value |  | 13 |
National [Member] | MBIA Inc Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes owned at par value |  | 264 |
Senior notes purchased at par value |  | 129 |
Mbia Corp [Member] | Undrawn [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from subordinated financing |  | $ 50 |
Variable Interest Entity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 6.01% | 2.25%
Maximum [Member] | Medium Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 6.00% | 6.00%
Maximum [Member] | Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 6.88% | 6.89%
Maximum [Member] | Variable Interest Entity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 14.00% | 2.77%
Minimum [Member] | Medium Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 0.00% | 0.00%
Minimum [Member] | Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 4.74% | 4.48%
Minimum [Member] | Variable Interest Entity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 1.85% | 1.07%

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