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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair value of securities pledged as collateral	$ 353	$ 416
Securities posted as collateral to derivative counterparties	237	276
Cash and money market securities pledged as collateral under investment agreements	146	187	$ 522	$ 782
National Public Finance Guarantee Holdings, Inc. [Member]
Senior notes purchased at par value	129
Dividends from subsidiaries	118	118	114
Trifinium Holdings Limited [Member]
Dividends from subsidiaries			1
MBIA Services Corporation [Member]
Dividends from subsidiaries			$ 1
MBIA Inc. [Member]
Fair value of securities pledged as collateral	350	394
Securities posted as collateral to derivative counterparties	$ 237	276
Fair Value Of The Collateral Pledged By MBIA Inc [Member] | MBIA Inc. [Member]
Money market securities pledged as collateral under investment agreements		$ 6

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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