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Investments (Significant Assumptions Used to Determine the Credit Loss Component of Other Than Temporary Impariment on Residential Mortgage Backed Securities) (Details) - Residential Mortgage Backed Securities [Member] | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Prime Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate | 7.00% | 7.70%
Default rate | 8.00% | 8.00%
Loss severity | 40.00% | 50.00%
Prime Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate | 7.70% | 7.70%
Default rate | 22.00% | 14.00%
Loss severity | 50.00% | 50.00%
Prime Sector [Member] | Vintage Year 2006 [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate | 7.30% | 6.50%
Default rate | 14.00% | 12.00%
Loss severity | 40.00% | 40.00%
Prime Sector [Member] | Vintage Year 2006 [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate | 7.30% | 7.30%
Default rate | 14.00% | 13.00%
Loss severity | 40.00% | 50.00%
Prime Sector [Member] | Vintage Year 2007 [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate | 6.20% | 6.20%
Default rate | 15.00% | 18.00%
Loss severity | 50.00% | 50.00%
Prime Sector [Member] | Vintage Year 2007 [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate | 6.70% | 6.40%
Default rate | 27.00% | 31.00%
Loss severity | 60.00% | 55.00%
Alt-A Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate |  | 7.40%
Default rate |  | 11.00%
Loss severity |  | 60.00%
Alt-A Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rate |  | 7.40%
Default rate |  | 11.00%
Loss severity |  | 60.00%

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- Definition This item represents the discount rate on the underlying assets in the security that was considered as one of the potential factors in reaching a conclusion that the investments in marketable securities are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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- Definition This item represents the loss severity rate of the underlying assets in the security that was considered as one of the potential factors in reaching a conclusion that the investments in marketable securities are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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- Definition This item represents the default rate of the underlying assets in the security that was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8A -Subparagraph a.1. -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284381-111563 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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