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Fair Value Of Financial Instruments (Changes In Fair Value Included In the Company's Consolidated Income Statement) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Net gains (losses) on financial instruments at fair value and foreign exchange	$ (103)		$ (2)		$ (127)		$ (48)
Realized Investment Gains Losses	(19)	[1]	(14)	[1]	4	[1]	(44)	[1]
Loan Repurchase Commitments [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	39		77		70		293
Realized Investment Gains Losses							63
Total Changes in Fair Value	39		77		70		356
Fixed Maturity Securities Held At Fair Value [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	(265)		231		(52)		248
Realized Investment Gains Losses							21
Total Changes in Fair Value	(265)		231		(52)		269
Other Loans [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	(35)		44		7		18
Realized Investment Gains Losses
Total Changes in Fair Value	(35)		44		7		18
Residential Mortgage Loans [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	29		130		130		368
Realized Investment Gains Losses							220
Total Changes in Fair Value	29		130		130		588
Other Assets [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	18		(2)		(22)		(1)
Realized Investment Gains Losses							159
Total Changes in Fair Value	18		(2)		(22)		158
Long-term Debt [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	252		(123)		(115)		(424)
Realized Investment Gains Losses							(333)
Total Changes in Fair Value	$ 252		$ (123)		$ (115)		$ (757)
[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.

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- 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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X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959

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- 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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