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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 18,924,711 | $ 17,575,507
Available-for-sale Securities | $ 19,619,084 | $ 17,708,156
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 | $ 6,725,199 | $ 5,408,791
Available-for-sale Securities | $ 6,888,968 | $ 5,555,044
Percentage Of Total Available For Sales Securities | 35.20% | 31.40%
Commercial and Industrial Sector [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 10,228,813 | $ 10,211,426
Available-for-sale Securities | $ 10,639,613 | $ 10,129,917
Percentage Of Total Available For Sales Securities | 54.20% | 57.20%
Utility Industry [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 1,970,699 | $ 1,955,290
Available-for-sale Securities | $ 2,090,503 | $ 2,023,195
Percentage Of Total Available For Sales Securities | 10.60% | 11.40%

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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=65884222&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=73527792&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=66010992&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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