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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 |

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