Schedule II (Notes to Condensed Financial Statements) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair value of securities pledged as collateral	$ 820	$ 1,900
Fair value of securities posted to derivative counterparties		470
Optinuity Alliance Resource Corporation [Member]
Declared and paid dividends	53	38
Euro Asset Acquisition Limited [Member]
Declared and paid dividends	1	8
MBIA Inc General Corporate Purposes [Member]
Liquid assets	170
MBIA Inc. [Member]
Liquid assets	239	386
Declared and paid dividends	6
Fair value of securities pledged as collateral	318	428
Fair value of securities posted to derivative counterparties	0	470
MBIA Inc Not Pledged As Collateral [Member]
Liquid assets	69
Fair Value Of The Collateral Pledged By MBIA Inc [Member] \| MBIA Inc. [Member]
Money market securities pledged as collateral under investment agreements	144	224
MBIA Corp Secured Loan [Member]
Securities sold under agreements to repurchase		$ 300

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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