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Investments (Fair Values and Gross Unrealized Losses by Credit Rating Category of Mortgage Backed Securities) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Total, Fair Value	$ 4,412		$ 6,954
Total, Unrealized Losses	532		804
Mortgage-backed Securities [Member] | Commercial Mortgage-Backed [Member]
Total, Fair Value	51
Total, Unrealized Losses	(6)
Mortgage-backed Securities [Member] | Commercial Mortgage-Backed [Member] | Aaa [Member]
Total, Fair Value	1
Mortgage-backed Securities [Member] | Commercial Mortgage-Backed [Member] | Aa [Member]
Total, Fair Value	17
Total, Unrealized Losses	(1)
Mortgage-backed Securities [Member] | Commercial Mortgage-Backed [Member] | A [Member]
Total, Fair Value	1
Mortgage-backed Securities [Member] | Commercial Mortgage-Backed [Member] | Baa [Member]
Total, Fair Value	27
Total, Unrealized Losses	(5)
Mortgage-backed Securities [Member] | Commercial Mortgage-Backed [Member] | Below Investment Grade [Member]
Total, Fair Value	1
Mortgage-backed Securities [Member] | Commercial Mortgage-Backed [Member] | Not Rated [Member]
Total, Fair Value	4
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Collateralized [Member]
Total, Fair Value	161
Total, Unrealized Losses	(40)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Collateralized [Member] | Aaa [Member]
Total, Fair Value	63
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Collateralized [Member] | Aa [Member]
Total, Fair Value	50
Total, Unrealized Losses	(15)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Collateralized [Member] | A [Member]
Total, Fair Value	11
Total, Unrealized Losses	(1)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Collateralized [Member] | Below Investment Grade [Member]
Total, Fair Value	36
Total, Unrealized Losses	(21)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Collateralized [Member] | Not Rated [Member]
Total, Fair Value	1
Total, Unrealized Losses	(3)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Home equity [Member]
Total, Fair Value	219
Total, Unrealized Losses	(67)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Home equity [Member] | Aaa [Member]
Total, Fair Value	27
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Home equity [Member] | Aa [Member]
Total, Fair Value	90
Total, Unrealized Losses	(22)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Home equity [Member] | A [Member]
Total, Fair Value	2
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Home equity [Member] | Baa [Member]
Total, Fair Value	1
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Home equity [Member] | Below Investment Grade [Member]
Total, Fair Value	99
Total, Unrealized Losses	(45)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Pass-through securities [Member]
Total, Fair Value	391
Total, Unrealized Losses	(5)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Pass-through securities [Member] | Aaa [Member]
Total, Fair Value	391
Total, Unrealized Losses	(5)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Other RMBS [Member]
Total, Fair Value	27
Total, Unrealized Losses	(8)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Other RMBS [Member] | Aa [Member]
Total, Fair Value	18
Total, Unrealized Losses	(4)
Mortgage-backed Securities [Member] | Residential Mortgage-Backed Agency [Member] | Other RMBS [Member] | Below Investment Grade [Member]
Total, Fair Value	9
Total, Unrealized Losses	(4)
MBIA [Member] | Mortgage-backed Securities [Member]
Total, Fair Value	15	[1]
Total, Unrealized Losses	5	[1]
Mortgage-backed Securities [Member]
Total, Fair Value	849
Total, Unrealized Losses	(126)
Mortgage-backed Securities [Member] | Aaa [Member]
Total, Fair Value	482
Total, Unrealized Losses	(5)
Mortgage-backed Securities [Member] | Aa [Member]
Total, Fair Value	175
Total, Unrealized Losses	(42)
Mortgage-backed Securities [Member] | A [Member]
Total, Fair Value	14
Total, Unrealized Losses	(1)
Mortgage-backed Securities [Member] | Baa [Member]
Total, Fair Value	28
Total, Unrealized Losses	(5)
Mortgage-backed Securities [Member] | Below Investment Grade [Member]
Total, Fair Value	145
Total, Unrealized Losses	(70)
Mortgage-backed Securities [Member] | Not Rated [Member]
Total, Fair Value	5
Total, Unrealized Losses	$ (3)
[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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