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Investments (Fair Values And Gross Unrealized Losses By Credit Rating Category Of Mortgage Backed Securities) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	$ 1,025	$ 2,387
Total, Unrealized Losses	(191)	(478)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	270
Total, Unrealized Losses	(52)
Mortgage-Backed Securities [Member] | Commercial Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	29
Total, Unrealized Losses	(5)
Collateralized [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	109
Total, Unrealized Losses	(12)
Home Equity [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	116
Total, Unrealized Losses	(32)
Pass-Through Securities [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	8
Other RMBS [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	8
Total, Unrealized Losses	(3)
Aaa [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	49
Aaa [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	41
Aaa [Member] | Pass-Through Securities [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	8
Aa [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	89
Total, Unrealized Losses	(13)
Aa [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	24
Aa [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	57
Total, Unrealized Losses	(10)
Aa [Member] | Other RMBS [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	8
Total, Unrealized Losses	(3)
Baa [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	30
Total, Unrealized Losses	(5)
Baa [Member] | Mortgage-Backed Securities [Member] | Commercial Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	27
Total, Unrealized Losses	(4)
Baa [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	3
Total, Unrealized Losses	(1)
Below Investment Grade [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	88
Total, Unrealized Losses	(27)
Below Investment Grade [Member] | Mortgage-Backed Securities [Member] | Commercial Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	2
Total, Unrealized Losses	(1)
Below Investment Grade [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	30
Total, Unrealized Losses	(5)
Below Investment Grade [Member] | Home Equity [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	56
Total, Unrealized Losses	(21)
Not Rated [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	14
Total, Unrealized Losses	(7)
Not Rated [Member] | Collateralized [Member] | Mortgage-Backed Securities [Member] | Residential Mortgage-Backed Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	14
Total, Unrealized Losses	$ (7)

X

- Definition

Amount of the excess of amortized cost basis over fair value of securities in a loss position and 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

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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 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



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 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.

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Data Type:	xbrli:monetaryItemType
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