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Debt (Narrative) (Detail) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 20, 2017 | Jan. 10, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate |  |  | 14.00% |
Surplus notes at par value owned by MBIA Inc. |  |  | $ 13 |
Senior notes at par value owned by National |  |  | 136 |
Accrued interest |  |  | $ 506 | $ 394
SubsequentEvent [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from Senior Lenders |  | $ 325 |  |
MBIA Corp Surplus Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate terms |  |  | Contractual interest rate is based on three month LIBOR plus 11.26%. Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100. |
Medium Term Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repurchase of MTNs |  |  | $ 6 |
Annual interest rates, minimum |  |  | 0.00% | 0.00%
Annual interest rates, maximum |  |  | 6.00% | 6.40%
Weighted average interest rate |  |  | 2.43% | 2.42%
Par value redeemed |  |  | $ 4 |
Percent of par |  |  | 97.00% |
Investment Agreement Obligations [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rates, minimum |  |  | 4.48% | 4.40%
Annual interest rates, maximum |  |  | 6.89% | 6.89%
Weighted average interest rate |  |  | 5.66% | 5.56%
Mbia Inc [Member] | SubsequentEvent [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from subordinated financing |  | $ 38 |  |
Mbia Corp [Member] | Undrawn [Member] | SubsequentEvent [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from subordinated financing | $ 50 |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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