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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 17,575,507 | $ 14,010,604
Available-for-sale Securities | $ 17,708,156 | $ 14,885,583
Percentage Of Total Available For Sales Securities | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 5,408,791 | $ 4,789,568
Available-for-sale Securities | $ 5,555,044 | $ 5,066,408
Percentage Of Total Available For Sales Securities | 31.40% | 34.00%
Commercial and Industrial Sector [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 10,211,426 | $ 7,639,330
Available-for-sale Securities | $ 10,129,917 | $ 8,086,067
Percentage Of Total Available For Sales Securities | 57.20% | 54.30%
Utility Industry [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 1,955,290 | $ 1,581,706
Available-for-sale Securities | $ 2,023,195 | $ 1,733,108
Percentage Of Total Available For Sales Securities | 11.40% | 11.70%

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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=51813488&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=49167202&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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