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Business and Risks (Narrative) (Detail) (USD $) Share data in Millions, unless otherwise specified | 0 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended
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May 07, 2013 numberofinstitutions | Jun. 30, 2013 segments | Jun. 30, 2013 Mbia Inc [Member] | Dec. 31, 2012 Mbia Inc [Member] | Jun. 30, 2013 Mbia Corp [Member] | Dec. 31, 2012 Mbia Corp [Member] | May 06, 2013 Bank Of America [Member] | May 07, 2013 Societe Generale [Member] | May 02, 2013 Flagstar Bank [Member] | Mar. 31, 2013 Amount Outstanding [Member] | May 06, 2013 Amount Outstanding Before Bofa Settlement [Member] | May 06, 2013 Corporate Obligations [Member] Bank Of America [Member] | May 06, 2013 Cash [Member] Bank Of America [Member] | May 06, 2013 Warrant [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 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from legal settlements |  |  |  |  |  |  | $ 1,700,000,000 |  | $ 110,000,000 |  |  | $ 136,000,000 | $ 1,600,000,000 |  |
MBIA debt coupon rate |  |  | 5.70% |  |  |  |  |  |  |  |  |  |  |  |
Warrant Term |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Stock Issued During Period Shares New Issues |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.94 |
Warrant exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.59 |
Settlement without prejudice term |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Line of credit maximum amount |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |
Line of credit term |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
National secured loan |  |  |  |  |  |  |  |  |  | 1,700,000,000 | 1,600,000,000 |  |  |  |
Number of resolved Article 78 plaintiffs | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquid assets |  |  | 327,000,000 | 239,000,000 | 92,000,000 | 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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