Schedule II (Notes to Condensed Financial Statements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair value of securities pledged as collateral	$ 1,900	$ 2,400
Fair value of securities posted to derivative counterparties	470	452
Optinuity Alliance Resource Corporation [Member]
Declared and paid dividends	38.0
Euro Asset Acquisition Limited [Member]
Declared and paid dividends	8.0
Cutwater Holdings, LLC [Member]
Declared and paid dividends		19.0
MBIA Inc. [Member]
Liquid Assets	226
Fair value of securities pledged as collateral	428	590
Fair value of securities posted to derivative counterparties	470	452
Asset Liabilitiy Products [Member]
Liquid Assets	160
Securities Pledged as Collateral [Member] \| MBIA Inc. [Member]
Money market securities pledged as collateral under investment agreements	224	113
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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