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Investments (Significant Assumptions in Determining Credit Loss Component of Other Than Temporary Impairment on Residential Mortgage Backed Securities) (Details) - Residential Mortgage Backed Securities - Prime Sector	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Vintage Year 2005 | Minimum
Schedule of Available-for-sale Securities [Line Items]
Discount rate	7.00%	7.00%
Default rate	14.00%	8.00%
Loss severity	40.00%	40.00%
Vintage Year 2005 | Maximum
Schedule of Available-for-sale Securities [Line Items]
Discount rate	7.70%	7.70%
Default rate	23.00%	22.00%
Loss severity	50.00%	50.00%
Vintage Year 2006 | Minimum
Schedule of Available-for-sale Securities [Line Items]
Discount rate		7.30%
Default rate		14.00%
Loss severity		40.00%
Vintage Year 2006 | Maximum
Schedule of Available-for-sale Securities [Line Items]
Discount rate		7.30%
Default rate		14.00%
Loss severity		40.00%
Vintage Year 2007 | Minimum
Schedule of Available-for-sale Securities [Line Items]
Discount rate	6.60%	6.20%
Default rate	17.00%	15.00%
Loss severity	60.00%	50.00%
Vintage Year 2007 | Maximum
Schedule of Available-for-sale Securities [Line Items]
Discount rate	6.60%	6.60%
Default rate	17.00%	19.00%
Loss severity	60.00%	60.00%

X

- 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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X

- 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

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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

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