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Debt (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 MBIA Inc Senior Notes [Member] | Dec. 31, 2012 MBIA Inc Senior Notes [Member] | Dec. 31, 2013 MBIA Corp Surplus Notes [Member] | Dec. 31, 2013 Medium Term Notes [Member] | Dec. 31, 2012 Medium Term Notes [Member] | Dec. 31, 2013 Medium Term Notes [Member] Conduits [Member] | Dec. 31, 2013 Medium Term Notes [Member] Global Funding Limited [Member] | Dec. 31, 2013 Investment Agreement Obligations [Member] | Dec. 31, 2012 Investment Agreement Obligations [Member] | May 06, 2013 Bank Of America [Member] | Dec. 31, 2013 Bank Of America [Member] MBIA Inc Senior Notes [Member] | Jan. 16, 2008 Mbia Corp [Member] | Jan. 16, 2008 Mbia Corp [Member] MBIA Corp Surplus Notes [Member] | May 06, 2013 Blue Ridge [Member] | Dec. 31, 2013 Blue Ridge [Member] | Nov. 30, 2013 Blue Ridge [Member] | May 06, 2013 Blue Ridge [Member] Libor Rate Loans [Member] Applicable Margin [Member] | May 06, 2013 Blue Ridge [Member] Base Rate Loans [Member] Applicable Margin [Member] | May 06, 2013 Blue Ridge [Member] Base Rate Loans [Member] Federal Funds Rate Margin [Member] | May 06, 2013 Blue Ridge [Member] Base Rate Loans [Member] Adjusted Libor Rate Margin [Member] | Dec. 31, 2012 Variable Interest Entity [Member] Medium Term Notes [Member] | Dec. 31, 2013 Variable Interest Entity [Member] Medium Term Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount in excess of stated amount | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surplus notes outstanding | 940 | [1] | 940 | [1] |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |  |  |  |  |  |  |  |
Interest rate terms |  |  |  |  |  |  | interest rate of 14% until January 15, 2013 and thereafter have an interest rate of three-month LIBOR plus 11.26% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, base reference rate | three-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 11.26% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surplus notes purchased at par value |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surplus notes repurchased at outstanding par value |  |  |  |  |  |  | 47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surplus notes, weighted average price per unit | 77.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual interest rates, minimum |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  | 0.21% | 0.28% |  |  |  |  |  |  |  |  |  |  |  | 0.55% |
Annual interest rates, maximum |  |  |  |  |  |  |  | 8.93% | 8.08% |  |  | 7.38% | 7.38% |  |  |  |  |  |  |  |  |  |  |  | 1.71% |
Weighted average interest rate |  |  |  |  |  |  |  | 2.67% | 2.89% |  |  | 5.10% | 5.04% |  |  |  |  |  |  |  |  |  |  |  | 1.28% | 1.02%
Accrued interest |  |  |  |  | 8 | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 592 |  | 732 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received on litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700 | 136 |  |  |  |  |  |  |  |  |  |  |
Par value redeemed |  |  |  |  |  |  |  |  |  | 506 | 192 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average percent of par |  |  |  |  |  |  |  |  |  | 99.86% | 91.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |
Line of credit amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |
Line of credit interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% | 6.50% | 0.50% | 1.00% |  |
Line of credit commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Line of credit interest and commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72 |  |  |  |  |  |  |
Line of credit term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
[1] | Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.

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