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Investments (Fair Values And Gross Unrealized Losses By Credit Rating Category Of Mortgage Backed Securities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Investment [Line Items]
Total, Fair Value	$ 2,092	$ 2,387
Total, Unrealized Losses	(278)	(478)
Mortgage-Backed Securities [Member]
Investment [Line Items]
Total, Fair Value	360
Total, Unrealized Losses	(91)
Mortgage-Backed Securities [Member] | Aaa [Member]
Investment [Line Items]
Total, Fair Value	77
Total, Unrealized Losses
Mortgage-Backed Securities [Member] | Aa [Member]
Investment [Line Items]
Total, Fair Value	116
Total, Unrealized Losses	(20)
Mortgage-Backed Securities [Member] | A [Member]
Investment [Line Items]
Total, Fair Value	9
Total, Unrealized Losses
Mortgage-Backed Securities [Member] | Baa [Member]
Investment [Line Items]
Total, Fair Value	25
Total, Unrealized Losses	(6)
Mortgage-Backed Securities [Member] | Below Investment Grade [Member]
Investment [Line Items]
Total, Fair Value	120
Total, Unrealized Losses	(56)
Mortgage-Backed Securities [Member] | Not Rated [Member]
Investment [Line Items]
Total, Fair Value	13
Total, Unrealized Losses	(9)
Commercial Mortgage-Backed [Member] | Mortgage-Backed Securities [Member]
Investment [Line Items]
Total, Fair Value	28
Total, Unrealized Losses	(7)
Commercial Mortgage-Backed [Member] | Mortgage-Backed Securities [Member] | Aaa [Member]
Investment [Line Items]
Total, Unrealized Losses
Commercial Mortgage-Backed [Member] | Mortgage-Backed Securities [Member] | A [Member]
Investment [Line Items]
Total, Unrealized Losses
Commercial Mortgage-Backed [Member] | Mortgage-Backed Securities [Member] | Baa [Member]
Investment [Line Items]
Total, Fair Value	24
Total, Unrealized Losses	(6)
Commercial Mortgage-Backed [Member] | Mortgage-Backed Securities [Member] | Below Investment Grade [Member]
Investment [Line Items]
Total, Fair Value	4
Total, Unrealized Losses	(1)
Residential Mortgage-Backed Securities [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member]
Investment [Line Items]
Total, Fair Value	145
Total, Unrealized Losses	(29)
Residential Mortgage-Backed Securities [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Aaa [Member]
Investment [Line Items]
Total, Fair Value	62
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Aa [Member]
Investment [Line Items]
Total, Fair Value	27
Total, Unrealized Losses	(3)
Residential Mortgage-Backed Securities [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | A [Member]
Investment [Line Items]
Total, Fair Value	8
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Baa [Member]
Investment [Line Items]
Total, Fair Value	1
Residential Mortgage-Backed Securities [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Below Investment Grade [Member]
Investment [Line Items]
Total, Fair Value	34
Total, Unrealized Losses	(17)
Residential Mortgage-Backed Securities [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Not Rated [Member]
Investment [Line Items]
Total, Fair Value	13
Total, Unrealized Losses	(9)
Residential Mortgage-Backed Securities [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member]
Investment [Line Items]
Total, Fair Value	158
Total, Unrealized Losses	(48)
Residential Mortgage-Backed Securities [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member] | Aaa [Member]
Investment [Line Items]
Total, Fair Value	2
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member] | Aa [Member]
Investment [Line Items]
Total, Fair Value	80
Total, Unrealized Losses	(14)
Residential Mortgage-Backed Securities [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member] | A [Member]
Investment [Line Items]
Total, Fair Value	1
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member] | Below Investment Grade [Member]
Investment [Line Items]
Total, Fair Value	75
Total, Unrealized Losses	(34)
Residential Mortgage-Backed Securities [Member] | Pass-Through Securities [Member] | Mortgage-Backed Securities [Member]
Investment [Line Items]
Total, Fair Value	13
Residential Mortgage-Backed Securities [Member] | Pass-Through Securities [Member] | Mortgage-Backed Securities [Member] | Aaa [Member]
Investment [Line Items]
Total, Fair Value	13
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Pass-Through Securities [Member] | Mortgage-Backed Securities [Member] | A [Member]
Investment [Line Items]
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Other RMBS [Member] | Mortgage-Backed Securities [Member]
Investment [Line Items]
Total, Fair Value	16
Total, Unrealized Losses	(7)
Residential Mortgage-Backed Securities [Member] | Other RMBS [Member] | Mortgage-Backed Securities [Member] | Aaa [Member]
Investment [Line Items]
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Other RMBS [Member] | Mortgage-Backed Securities [Member] | Aa [Member]
Investment [Line Items]
Total, Fair Value	9
Total, Unrealized Losses	(3)
Residential Mortgage-Backed Securities [Member] | Other RMBS [Member] | Mortgage-Backed Securities [Member] | A [Member]
Investment [Line Items]
Total, Unrealized Losses
Residential Mortgage-Backed Securities [Member] | Other RMBS [Member] | Mortgage-Backed Securities [Member] | Below Investment Grade [Member]
Investment [Line Items]
Total, Fair Value	7
Total, Unrealized Losses	$ (4)

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- 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

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-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

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-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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- 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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