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Investments (Fair Values And Gross Unrealized Losses By Credit Rating Category Of Asset 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)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	273
Total, Unrealized Losses	(99)
Asset-Backed Securities [Member] | ABS CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	30
Total, Unrealized Losses	(51)
Asset-Backed Securities [Member] | Corporate CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	203
Total, Unrealized Losses	(43)
Asset-Backed Securities [Member] | Small Business/ Student Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	15
Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	25
Total, Unrealized Losses	(5)
Aaa [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	46
Total, Unrealized Losses	(2)
Aaa [Member] | Asset-Backed Securities [Member] | ABS CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	9
Aaa [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	29
Total, Unrealized Losses	(2)
Aaa [Member] | Asset-Backed Securities [Member] | Small Business/ Student Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	5
Aaa [Member] | Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	3
Aa [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	65
Total, Unrealized Losses	(9)
Aa [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	64
Total, Unrealized Losses	(9)
Aa [Member] | Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	1
A [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	7
A [Member] | Asset-Backed Securities [Member] | ABS CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	4
A [Member] | Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	3
Baa [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	1
Baa [Member] | Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	1
Below Investment Grade [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	128
Total, Unrealized Losses	(83)
Below Investment Grade [Member] | Asset-Backed Securities [Member] | ABS CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	17
Total, Unrealized Losses	(51)
Below Investment Grade [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	91
Total, Unrealized Losses	(30)
Below Investment Grade [Member] | Asset-Backed Securities [Member] | Small Business/ Student Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	10
Below Investment Grade [Member] | Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	10
Total, Unrealized Losses	(2)
Not Rated [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	26
Total, Unrealized Losses	(5)
Not Rated [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	19
Total, Unrealized Losses	(2)
Not Rated [Member] | Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Fair Value	7
Total, Unrealized Losses	$ (3)

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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