Schedule II (Condensed Balance Sheets) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets [Abstract]
Cash and cash equivalents	$ 782	$ 1,258	$ 990	$ 633
Total assets	16,284us-gaap_Assets	16,953us-gaap_Assets	21,724us-gaap_Assets
Liabilities:
Long-term debt	1,810us-gaap_LongTermDebtNoncurrent	1,702us-gaap_LongTermDebtNoncurrent
Derivative liabilities	246us-gaap_DerivativeLiabilities	1,200us-gaap_DerivativeLiabilities
Total liabilities	12,334us-gaap_Liabilities	13,654us-gaap_Liabilities
Equity:
Preferred stock, par value $1 per share; authorized shares--10,000,000; issued and outstanding--none	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--281,352,782 and 277,812,430	281us-gaap_CommonStockValue	278us-gaap_CommonStockValue
Additional paid-in capital	3,128us-gaap_AdditionalPaidInCapital	3,115us-gaap_AdditionalPaidInCapital
Retained earnings	2,858	2,289
Accumulated other comprehensive income (loss), net of tax of $6 and $26	21	(86)	56	(176)
Treasury stock, at cost--89,409,887 and 85,562,546 shares	(2,359)us-gaap_TreasuryStockValue	(2,318)us-gaap_TreasuryStockValue
Total shareholders' equity of MBIA Inc.	3,929us-gaap_StockholdersEquity	3,278us-gaap_StockholdersEquity
Total liabilities and equity	16,284	16,953
Fixed-maturity securities held as available-for-sale, amortized cost	6,509	6,824
Preferred stock, par value	$ 1	$ 1
Preferred stock, authorized shares	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
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Common stock, par value	$ 1	$ 1
Common stock, authorized shares	400,000,000us-gaap_CommonStockSharesAuthorized	400,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued shares	281,352,782us-gaap_CommonStockSharesIssued	277,812,430us-gaap_CommonStockSharesIssued
Accumulated other comprehensive income (loss), taxes	7	54
Treasury stock, shares	89,409,887us-gaap_TreasuryStockShares	85,562,546us-gaap_TreasuryStockShares
Parent Company [Member]
Assets [Abstract]
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $671 and $703)	751	728
Investments carried at fair value	33	32
Investments pledged as collateral, at fair value (amortized cost $445 and $463)	408	375
Short-term investments held as available-for-sale, at fair value (amortized cost $327 and $171)	327	171
Other investments	4	3
Total investments	1,523	1,309
Cash and cash equivalents	100	140	92	132
Investment in wholly-owned subsidiaries	3,953	3,890
Deferred income taxes, net	965	791
Other assets	143	140
Total assets	6,684	6,270
Liabilities:
Investment agreements	505	654
Long-term debt	592	592
Affiliate loans payable	1,207	1,510
Other liabilities	451	236
Total liabilities	2,755	2,992
Equity:
Preferred stock, par value $1 per share; authorized shares--10,000,000; issued and outstanding--none	0	0
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--281,352,782 and 277,812,430	281	278
Additional paid-in capital	3,128	3,115
Retained earnings	2,858	2,289
Accumulated other comprehensive income (loss), net of tax of $6 and $26	21	(86)
Treasury stock, at cost--89,409,887 and 85,562,546 shares	(2,359)	(2,318)
Total shareholders' equity of MBIA Inc.	3,929	3,278
Total liabilities and equity	6,684	6,270
Fixed-maturity securities held as available-for-sale, amortized cost	671	703
Investments pledged as collateral, amortized cost	445	463
Short-term investments held as available-for-sale, amortized cost	327	171
Preferred stock, par value	$ 1	$ 1
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 1	$ 1
Common stock, authorized shares	400,000,000	400,000,000
Common stock, issued shares	281,352,782	277,812,430
Accumulated other comprehensive income (loss), taxes	$ 6	$ 25
Treasury stock, shares	89,409,887	85,562,546

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