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Investments (Fair Values and Gross Unrealized Losses by Credit Rating Category of Corporate Obligations) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Total, Fair Value	$ 4,412		$ 6,954
Total, Unrealized Losses	532		804
MBIA [Member] | Corporate Obligations [Member]
Total, Fair Value	173	[1]
Total, Unrealized Losses	13	[1]
Corporate Obligations [Member]
Total, Fair Value	859
Total, Unrealized Losses	(73)
Corporate Obligations [Member] | Aaa [Member]
Total, Fair Value	83
Corporate Obligations [Member] | Aa [Member]
Total, Fair Value	174
Total, Unrealized Losses	(16)
Corporate Obligations [Member] | A [Member]
Total, Fair Value	295
Total, Unrealized Losses	(23)
Corporate Obligations [Member] | Baa [Member]
Total, Fair Value	227
Total, Unrealized Losses	(30)
Corporate Obligations [Member] | Below Investment Grade [Member]
Total, Fair Value	79
Total, Unrealized Losses	(2)
Corporate Obligations [Member] | Not Rated [Member]
Total, Fair Value	1
Total, Unrealized Losses	$ (2)
[1] - Includes investments insured by MBIA Corp. and National.

X

- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a
-Clause 2
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a
-Clause 2
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a(2)
-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 FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a(1)
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

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