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Business and Risks (Narrative) (Detail) (USD $) Share data in Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended
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May 07, 2013 numberofinstitutions | Sep. 30, 2013 | Sep. 30, 2013 segments | Sep. 30, 2013 Mbia Inc [Member] | Dec. 31, 2012 Mbia Inc [Member] | Sep. 30, 2013 Mbia Corp [Member] | Dec. 31, 2012 Mbia Corp [Member] | Sep. 30, 2013 National [Member] | Oct. 02, 2013 National [Member] SubsequentEvent [Member] | May 06, 2013 Bank Of America [Member] | May 06, 2013 Blue Ridge [Member] | Sep. 30, 2013 Blue Ridge [Member] | May 07, 2013 Societe Generale [Member] | May 02, 2013 Flagstar Bank [Member] | Aug. 05, 2013 Warburg Pincus [Member] | Mar. 31, 2013 Amount Outstanding [Member] | May 06, 2013 Amount Outstanding Before Bofa Settlement [Member] | May 06, 2013 Cash [Member] Bank Of America [Member] | Sep. 30, 2013 MBIA Inc Senior Notes [Member] | May 06, 2013 MBIA Inc Senior Notes [Member] Bank Of America [Member] | May 06, 2013 CMBS Pool Insured Gross Par [Member] Bank Of America [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance costs |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Headcount reduction percentage |  | 21.00% | 21.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate |  |  |  |  |  |  |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement expense |  |  | 89,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from legal settlements |  |  |  |  |  |  |  |  |  | 1,700,000,000 |  |  |  | 110,000,000 |  |  |  | 1,600,000,000 |  | 136,000,000 |
MBIA debt coupon rate |  |  |  | 5.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.70% |  |
Warrant term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  | 5 years |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |  |  |  |  | 9.94 |  |  |  | 1.91 |  |  |  |  |  |
Warrant exercise price |  |  |  |  |  |  |  |  |  |  | 9.59 |  |  |  | 9.59 |  |  |  |  |  |
Settlement without prejudice term |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum amount |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit amount outstanding |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Line of credit term |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
National secured loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000,000 | 1,600,000,000 |  |  |  |
Number of resolved Article 78 plaintiffs | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 214,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Liquid assets |  |  |  | 282,000,000 | 239,000,000 | 97,000,000 | 345,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount released from tax escrow account |  |  |  | 115,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commuted gross insured exposure |  |  |  |  |  | $ 19,900,000,000 |  |  |  | $ 7,400,000,000 |  |  | $ 4,200,000,000 |  |  |  |  |  |  |  | $ 6,100,000,000

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