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Investments (Fair Values And Gross Unrealized Losses By Credit Rating Category Of Asset Backed Securities) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | $ 2,092 | $ 2,387
Total, Unrealized Losses | 278 | 478
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 330 |
Total, Unrealized Losses | (125) |
Asset-Backed Securities [Member] | Aaa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 65 |
Total, Unrealized Losses | (4) |
Asset-Backed Securities [Member] | Aa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 74 |
Total, Unrealized Losses | (8) |
Asset-Backed Securities [Member] | A [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 29 |
Total, Unrealized Losses | (7) |
Asset-Backed Securities [Member] | Baa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 30 |
Total, Unrealized Losses | (3) |
Asset-Backed Securities [Member] | Below Investment Grade [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 131 |
Total, Unrealized Losses | (102) |
Asset-Backed Securities [Member] | Not Rated [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 1 |
Total, Unrealized Losses | (1) |
ABS CDO [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 34 |
Total, Unrealized Losses | (57) |
ABS CDO [Member] | Asset-Backed Securities [Member] | Aaa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 5 |
ABS CDO [Member] | Asset-Backed Securities [Member] | Aa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 5 |
ABS CDO [Member] | Asset-Backed Securities [Member] | A [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 7 |
Total, Unrealized Losses | (1) |
ABS CDO [Member] | Asset-Backed Securities [Member] | Baa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 1 |
Total, Unrealized Losses | (3) |
ABS CDO [Member] | Asset-Backed Securities [Member] | Below Investment Grade [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 16 |
Total, Unrealized Losses | (53) |
Corporate CDO [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 209 |
Total, Unrealized Losses | (62) |
Corporate CDO [Member] | Asset-Backed Securities [Member] | Aaa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 42 |
Total, Unrealized Losses | (4) |
Corporate CDO [Member] | Asset-Backed Securities [Member] | Aa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 65 |
Total, Unrealized Losses | (8) |
Corporate CDO [Member] | Asset-Backed Securities [Member] | A [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 13 |
Total, Unrealized Losses | (6) |
Corporate CDO [Member] | Asset-Backed Securities [Member] | Baa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 1 |
Corporate CDO [Member] | Asset-Backed Securities [Member] | Below Investment Grade [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 87 |
Total, Unrealized Losses | (43) |
Corporate CDO [Member] | Asset-Backed Securities [Member] | Not Rated [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 1 |
Total, Unrealized Losses | (1) |
Auto Loans [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 10 |
Auto Loans [Member] | Asset-Backed Securities [Member] | Aa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 1 |
Auto Loans [Member] | Asset-Backed Securities [Member] | Baa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 9 |
Equipment Leases [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 6 |
Equipment Leases [Member] | Asset-Backed Securities [Member] | Baa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 6 |
Small Business/ Student Loans [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 27 |
Total, Unrealized Losses | (1) |
Small Business/ Student Loans [Member] | Asset-Backed Securities [Member] | Aaa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 16 |
Small Business/ Student Loans [Member] | Asset-Backed Securities [Member] | Below Investment Grade [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 11 |
Total, Unrealized Losses | (1) |
Other ABS [Member] | Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 44 |
Total, Unrealized Losses | (5) |
Other ABS [Member] | Asset-Backed Securities [Member] | Aaa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 2 |
Other ABS [Member] | Asset-Backed Securities [Member] | Aa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 3 |
Other ABS [Member] | Asset-Backed Securities [Member] | A [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 9 |
Other ABS [Member] | Asset-Backed Securities [Member] | Baa [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 13 |
Other ABS [Member] | Asset-Backed Securities [Member] | Below Investment Grade [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Fair Value | 17 |
Total, Unrealized Losses | $ (5) |

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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 + Details
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