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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Collateral Fixed Maturity Securities [Member] | Dec. 31, 2013 Collateral Fixed Maturity Securities [Member] | Sep. 30, 2013 Collateral Received Fixed Maturity Securities [Member] | Dec. 31, 2012 Collateral Received Fixed Maturity Securities [Member] | Sep. 30, 2014 Reported Value Measurement [Member] | Dec. 31, 2013 Reported Value Measurement [Member] | Sep. 30, 2014 Portion at Fair Value Measurement [Member] | Dec. 31, 2013 Portion at Fair Value Measurement [Member]
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 13,413,102,000 | $ 11,697,394,000 | $ 72,000,000 | $ 57,000,000 |  |  |  |  |  |
Available-for-sale Securities | 14,190,456,000 | 12,110,755,000 | 74,000,000 | 58,000,000 | 126,000,000 | 94,000,000 |  |  |  |
Assets Held-in-trust |  |  |  |  |  |  | $ 9,350,000,000 | $ 7,843,000,000 | $ 9,917,000,000 | $ 8,125,000,000

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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