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Investments (Fair Values And Gross Unrealized Losses By Credit Rating Category Of Corporate Obligations) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Investment [Line Items] |  |
Total, Fair Value | $ 2,092 | $ 2,387
Total, Unrealized Losses | (278) | (478)
Corporate Obligations [Member] |  |
Investment [Line Items] |  |
Total, Fair Value | 495 |
Total, Unrealized Losses | (37) |
Corporate Obligations [Member] | Aaa [Member] |  |
Investment [Line Items] |  |
Total, Fair Value | 68 |
Corporate Obligations [Member] | Aa [Member] |  |
Investment [Line Items] |  |
Total, Fair Value | 57 |
Total, Unrealized Losses | (1) |
Corporate Obligations [Member] | A [Member] |  |
Investment [Line Items] |  |
Total, Fair Value | 267 |
Total, Unrealized Losses | (12) |
Corporate Obligations [Member] | Baa [Member] |  |
Investment [Line Items] |  |
Total, Fair Value | 80 |
Total, Unrealized Losses | (22) |
Corporate Obligations [Member] | Below Investment Grade [Member] |  |
Investment [Line Items] |  |
Total, Fair Value | 21 |
Corporate Obligations [Member] | Not Rated [Member] |  |
Investment [Line Items] |  |
Total, Fair Value | 2 |
Total, Unrealized Losses | $ (2) |

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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 -Subparagraph (a)(2) -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Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. 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. + 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 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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