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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 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | $ 1,558 | $ 2,387
Total, Unrealized Losses | (226) | (478)
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 288 |
Total, Unrealized Losses | (119) |
Asset-Backed Securities [Member] | ABS CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 32 |
Total, Unrealized Losses | (55) |
Asset-Backed Securities [Member] | Corporate CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 205 |
Total, Unrealized Losses | (57) |
Asset-Backed Securities [Member] | Auto Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 2 |
Asset-Backed Securities [Member] | Credit Card [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 2 |
Asset-Backed Securities [Member] | Small Business/ Student Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 16 |
Asset-Backed Securities [Member] | Other ABS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 31 |
Total, Unrealized Losses | (7) |
Aaa [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 50 |
Total, Unrealized Losses | (3) |
Aaa [Member] | Asset-Backed Securities [Member] | ABS CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 5 |
Aaa [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 36 |
Total, Unrealized Losses | (3) |
Aaa [Member] | Asset-Backed Securities [Member] | Credit Card [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 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 ABS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 2 |
Aa [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 72 |
Total, Unrealized Losses | (10) |
Aa [Member] | Asset-Backed Securities [Member] | ABS CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 5 |
Aa [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 63 |
Total, Unrealized Losses | (10) |
Aa [Member] | Asset-Backed Securities [Member] | Other ABS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 4 |
A [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 26 |
Total, Unrealized Losses | (3) |
A [Member] | Asset-Backed Securities [Member] | ABS CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 6 |
A [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 16 |
Total, Unrealized Losses | (3) |
A [Member] | Asset-Backed Securities [Member] | Other ABS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 4 |
Baa [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 6 |
Total, Unrealized Losses | (4) |
Baa [Member] | Asset-Backed Securities [Member] | ABS CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 1 |
Total, Unrealized Losses | (3) |
Baa [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 1 |
Baa [Member] | Asset-Backed Securities [Member] | Other ABS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 4 |
Total, Unrealized Losses | (1) |
Below Investment Grade [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 124 |
Total, Unrealized Losses | (94) |
Below Investment Grade [Member] | Asset-Backed Securities [Member] | ABS CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 15 |
Total, Unrealized Losses | (52) |
Below Investment Grade [Member] | Asset-Backed Securities [Member] | Corporate CDO [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 88 |
Total, Unrealized Losses | (40) |
Below Investment Grade [Member] | Asset-Backed Securities [Member] | Small Business/ Student Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 11 |
Below Investment Grade [Member] | Asset-Backed Securities [Member] | Other ABS [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 | 10 |
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 | 1 |
Total, Unrealized Losses | (1) |
Not Rated [Member] | Asset-Backed Securities [Member] | Auto Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 2 |
Not Rated [Member] | Asset-Backed Securities [Member] | Other ABS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 7 |
Total, Unrealized Losses | $ (4) |

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 + Details
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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 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. + Details
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