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Investments (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended																				6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2011 Asset-Backed Securities [Member] Asset / Liability Products [Member]	Jun. 30, 2011 Asset / Liability Products [Member]	Jun. 30, 2010 Asset / Liability Products [Member]	Jun. 30, 2011 Asset / Liability Products [Member]	Jun. 30, 2010 Asset / Liability Products [Member]	Jun. 30, 2011 MBIA [Member] Mortgage-backed Securities [Member] National [Member]	Jun. 30, 2011 MBIA [Member] Mortgage-backed Securities [Member] National [Member] 3rd Party Guarantors [Member]	Jun. 30, 2011 MBIA [Member] Asset-Backed Securities [Member] National [Member] 3rd Party Guarantors [Member]	Jun. 30, 2011 MBIA [Member] National [Member] 3rd Party Guarantors [Member] Corporate Obligations [Member]	Jun. 30, 2011 MBIA [Member] National [Member] Corporate Obligations [Member]	Jun. 30, 2011 Book Value Greater Than Market Value By More Than 5% [Member]	Dec. 31, 2010 Book Value Greater Than Market Value By More Than 5% [Member]	Jun. 30, 2011 MBIA [Member] Asset-Backed Securities [Member]		Jun. 30, 2011 Asset-Backed Securities [Member]	Jun. 30, 2011 MBIA [Member] Mortgage-backed Securities [Member]		Jun. 30, 2011 Mortgage-backed Securities [Member]	Jun. 30, 2011 MBIA [Member] Corporate Obligations [Member]		Jun. 30, 2011 Corporate Obligations [Member]	Jun. 30, 2011 Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2010 Variable Interest Entity, Primary Beneficiary [Member]	Jun. 30, 2011 Aggregate Unrealized Losses [Member]	Dec. 31, 2010 Aggregate Unrealized Losses [Member]
Fair value of securities on deposit with various regulatory authorities	$ 11,000,000		$ 11,000,000		$ 11,000,000
Fair value of securities pledged as collateral	2,100,000,000		2,100,000,000		2,400,000,000
Cash pledged as collateral under investment agreements	7,000,000		7,000,000			113,000,000
Investments held-to-maturity																												3,934,000,000	4,039,000,000
Fair value of held-to-maturity investments																												3,703,000,000	3,760,000,000
Unrecognized gross losses																												235,000,000	279,000,000
Unrecognized gross gains	4,000,000		4,000,000
Gross unrealized losses, portfolio	767,000,000,000		767,000,000,000		1,100,000,000
Gross unrealized losses, available for sale securities	532,000,000		532,000,000		804,000,000
12 months or longer, unrealized losses																														714,000,000	941,000,000
Rate of book value securities exceeded market value	5.00%		5.00%		5.00%
Number of securities, unrealized loss position for continuous 12-month period or longer	349		349		412												254	321
Weighted average contractual maturity period of securities, unrealized loss position	21		21		20
Rate of security impaired at time of review			20.00%
Rate of security impaired at time of review, fair value below amortized cost for consecutive 12-month period			5.00%
Company Investments Percent																					70.00%			82.00%			91.00%
Investment Grade Rated with Aaa																					19.00%			57.00%			10.00%
Investments Reported																											19,000,000
Fair value	4,412,000,000		4,412,000,000		6,954,000,000		596,000,000												332,000,000	[1]	698,000,000	15,000,000	[1]	849,000,000	173,000,000	[1]	859,000,000
Gross unrealized losses	532,000,000		532,000,000		804,000,000		158,000,000												78,000,000	[1]	(251,000,000)	5,000,000	[1]	(126,000,000)	13,000,000	[1]	(73,000,000)
Other-than-temporary impairments	20,000,000	13,000,000	33,000,000	43,000,000				18,000,000	12,000,000	29,000,000	39,000,000
Benefit of Guarantees Provided												15,000,000	292,000,000	332,000,000	56,000,000	154,000,000					93,000,000
Securities Rated Below Investment Grade																					$ 158,000,000			$ 308,000,000			$ 79,000,000
Securities Rated Below Investment Grade Percentage																					23.00%			36.00%			9.00%
[1] - Includes investments insured by MBIA Corp. and National.

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