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Fair Value Of Financial Instruments (Gains And Losses (Realized And Unrealized) Included In Earnings Pertaining To Level 3 Assets And Liabilities) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Unrealized gain (loss) on insured derivatives	$ 116		$ 1,538		$ (1,307)		$ (674)
Net realized gain (losses)	(19)	[1]	(14)	[1]	4	[1]	(44)	[1]
Net gains (losses) on financial instruments at fair value and foreign exchange	(103)		(2)		(127)		(48)
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Inputs, Level 3 [Member] | Total Gains (Losses) Included in Earnings [Member]
Net realized gain (losses)
Net gains (losses) on financial instruments at fair value and foreign exchange	60		56		(414)		74
Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Inputs, Level 3 [Member] | Change In Unrealized Gains (Losses) For The Period Included In Earnings For Assets And Liabilities Still Held [Member]
Net realized gain (losses)
Net gains (losses) on financial instruments at fair value and foreign exchange	114		56		(359)		74
Fair Value, Inputs, Level 3 [Member] | Total Gains (Losses) Included in Earnings [Member]
Unrealized gain (loss) on insured derivatives	115		1,536		(1,307)		(674)
Net realized gain (losses)	(193)		(91)		(547)		(145)
Net gains (losses) on financial instruments at fair value and foreign exchange	40		(5)		79		(1)
Fair Value, Inputs, Level 3 [Member] | Change In Unrealized Gains (Losses) For The Period Included In Earnings For Assets And Liabilities Still Held [Member]
Unrealized gain (loss) on insured derivatives	(897)		1,539		(2,128)		(691)
Net realized gain (losses)
Net gains (losses) on financial instruments at fair value and foreign exchange	37		8		77		20
Variable Interest Entity, Primary Beneficiary [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 22		$ 291		$ (85)		$ 414
[1] These balances are included in the "Net gains (losses) on financial instruments at fair value and foreign exchange" and "Net investment losses related to other-than-temporary impairments" line items on MBIA's consolidated statements of operations.

X

- Definition

Change in the fair value of and realized gains and losses on financial instruments and foreign exchange included in earnings.

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Namespace Prefix:	mbi
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X

- Definition

The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 3
-Subparagraph a
-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 325
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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