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Investments (Fair Values and Gross Unrealized Losses by Credit Rating Category of Asset Backed Securities) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Total, Fair Value	$ 4,412		$ 6,954
Total, Unrealized Losses	532		804
Asset-Backed Securities [Member] | ABS CDO [Member]
Total, Fair Value	81
Total, Unrealized Losses	(98)
Asset-Backed Securities [Member] | ABS CDO [Member] | Aaa [Member]
Total, Fair Value	2
Asset-Backed Securities [Member] | ABS CDO [Member] | Aa [Member]
Total, Fair Value	16
Total, Unrealized Losses	(4)
Asset-Backed Securities [Member] | ABS CDO [Member] | A [Member]
Total, Fair Value	7
Total, Unrealized Losses	(2)
Asset-Backed Securities [Member] | ABS CDO [Member] | Below Investment Grade [Member]
Total, Fair Value	56
Total, Unrealized Losses	(92)
Asset-Backed Securities [Member] | Corporate CDO [Member]
Total, Fair Value	236
Total, Unrealized Losses	(46)
Asset-Backed Securities [Member] | Corporate CDO [Member] | Aaa [Member]
Total, Fair Value	59
Total, Unrealized Losses	(6)
Asset-Backed Securities [Member] | Corporate CDO [Member] | Aa [Member]
Total, Fair Value	17
Total, Unrealized Losses	(4)
Asset-Backed Securities [Member] | Corporate CDO [Member] | A [Member]
Total, Fair Value	68
Total, Unrealized Losses	(11)
Asset-Backed Securities [Member] | Corporate CDO [Member] | Baa [Member]
Total, Fair Value	22
Total, Unrealized Losses	(7)
Asset-Backed Securities [Member] | Corporate CDO [Member] | Below Investment Grade [Member]
Total, Fair Value	44
Total, Unrealized Losses	(15)
Asset-Backed Securities [Member] | Corporate CDO [Member] | Not Rated [Member]
Total, Fair Value	26
Total, Unrealized Losses	(3)
Asset-Backed Securities [Member] | Auto Loans [Member]
Total, Fair Value	15
Asset-Backed Securities [Member] | Auto Loans [Member] | Aa [Member]
Total, Fair Value	2
Asset-Backed Securities [Member] | Auto Loans [Member] | Below Investment Grade [Member]
Total, Fair Value	13
Asset-Backed Securities [Member] | Credit cards [Member]
Total, Fair Value	48
Asset-Backed Securities [Member] | Credit cards [Member] | Aaa [Member]
Total, Fair Value	42
Asset-Backed Securities [Member] | Credit cards [Member] | Aa [Member]
Total, Fair Value	5
Asset-Backed Securities [Member] | Credit cards [Member] | Not Rated [Member]
Total, Fair Value	1
Asset-Backed Securities [Member] | Equipment leases [Member]
Total, Fair Value	32
Total, Unrealized Losses	(2)
Asset-Backed Securities [Member] | Equipment leases [Member] | Aaa [Member]
Total, Fair Value	1
Asset-Backed Securities [Member] | Equipment leases [Member] | Baa [Member]
Total, Fair Value	31
Total, Unrealized Losses	(2)
Asset-Backed Securities [Member] | Small business/ student loans [Member]
Total, Fair Value	31
Total, Unrealized Losses	(3)
Asset-Backed Securities [Member] | Small business/ student loans [Member] | Aaa [Member]
Total, Fair Value	19
Total, Unrealized Losses	(2)
Asset-Backed Securities [Member] | Small business/ student loans [Member] | Below Investment Grade [Member]
Total, Fair Value	12
Total, Unrealized Losses	(1)
Asset-Backed Securities [Member] | Other ABS [Member]
Total, Fair Value	255
Total, Unrealized Losses	(102)
Asset-Backed Securities [Member] | Other ABS [Member] | Aaa [Member]
Total, Fair Value	11
Asset-Backed Securities [Member] | Other ABS [Member] | Aa [Member]
Total, Fair Value	20
Total, Unrealized Losses	(3)
Asset-Backed Securities [Member] | Other ABS [Member] | A [Member]
Total, Fair Value	33
Total, Unrealized Losses	(6)
Asset-Backed Securities [Member] | Other ABS [Member] | Baa [Member]
Total, Fair Value	131
Total, Unrealized Losses	(10)
Asset-Backed Securities [Member] | Other ABS [Member] | Below Investment Grade [Member]
Total, Fair Value	23
Total, Unrealized Losses	(6)
Asset-Backed Securities [Member] | Other ABS [Member] | Not Rated [Member]
Total, Fair Value	37
Total, Unrealized Losses	(77)
MBIA [Member] | Asset-Backed Securities [Member]
Total, Fair Value	332	[1]
Total, Unrealized Losses	78	[1]
Asset-Backed Securities [Member]
Total, Fair Value	698
Total, Unrealized Losses	(251)
Asset-Backed Securities [Member] | Aaa [Member]
Total, Fair Value	134
Total, Unrealized Losses	(8)
Asset-Backed Securities [Member] | Aa [Member]
Total, Fair Value	60
Total, Unrealized Losses	(11)
Asset-Backed Securities [Member] | A [Member]
Total, Fair Value	108
Total, Unrealized Losses	(19)
Asset-Backed Securities [Member] | Baa [Member]
Total, Fair Value	184
Total, Unrealized Losses	(19)
Asset-Backed Securities [Member] | Below Investment Grade [Member]
Total, Fair Value	148
Total, Unrealized Losses	(114)
Asset-Backed Securities [Member] | Not Rated [Member]
Total, Fair Value	64
Total, Unrealized Losses	$ (80)
[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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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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