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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair value of securities pledged as collateral | $ 457 | $ 532 |  |
Securities posted as collateral to derivative counterparties | 259 | 198 |  |
Cash and money market securities pledged as collateral under investment agreements | 522 | 782 | $ 1,258 | $ 990
National Public Finance Guarantee Holdings, Inc. [Member] |  |  |  |
Dividends from subsidiaries | 114 | 220 | 214 |
Trifinium Holdings Limited [Member] |  |  |  |
Dividends from subsidiaries | 1 | 5 |  |
MBIA Services Corporation [Member] |  |  |  |
Dividends from subsidiaries | 1 |  | 2 |
CapMAC Holdings Inc. [Member] |  |  |  |
Dividends from subsidiaries |  |  | $ 3 |
MBIA Inc. [Member] |  |  |  |
Liquid assets | 416 | 498 |  |
Fair value of securities pledged as collateral | 402 | 273 |  |
Securities posted as collateral to derivative counterparties | 259 | 199 |  |
Fair Value Of The Collateral Pledged By MBIA Inc [Member] | MBIA Inc. [Member] |  |  |  |
Cash and money market securities pledged as collateral under investment agreements | $ 12 | $ 26 |  |

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