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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, 2013 | Dec. 31, 2012
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2003 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 5.10% |
Default rate | 2.00% |
Loss severity | 30.00% |
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2003 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 5.10% |
Default rate | 2.00% |
Loss severity | 30.00% |
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.50% | 6.50%
Default rate | 8.00% | 8.00%
Loss severity | 50.00% | 40.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 7.70% | 7.70%
Default rate | 18.00% | 19.00%
Loss severity | 65.00% | 50.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2006 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 5.80% | 5.80%
Default rate | 9.00% | 9.00%
Loss severity | 45.00% | 40.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2006 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.90% | 7.60%
Default rate | 16.00% | 19.00%
Loss severity | 50.00% | 55.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2007 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.20% | 6.10%
Default rate | 11.00% | 11.00%
Loss severity | 40.00% | 40.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2007 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.70% | 7.30%
Default rate | 25.00% | 38.00%
Loss severity | 60.00% | 60.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2008 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.60% |
Default rate | 16.00% |
Loss severity | 45.00% |
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2008 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.60% |
Default rate | 16.00% |
Loss severity | 45.00% |
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2009 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.80% |
Default rate | 17.00% |
Loss severity | 60.00% |
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2009 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.80% |
Default rate | 17.00% |
Loss severity | 60.00% |
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2004 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate |  | 5.80%
Default rate |  | 11.00%
Loss severity |  | 60.00%
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2004 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate |  | 5.80%
Default rate |  | 11.00%
Loss severity |  | 60.00%
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 5.60% | 5.60%
Default rate | 13.00% | 12.00%
Loss severity | 2.00% | 5.00%
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 8.70% | 8.70%
Default rate | 81.00% | 38.00%
Loss severity | 65.00% | 55.00%
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2006 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate |  | 6.00%
Default rate |  | 32.00%
Loss severity |  | 55.00%
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2006 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate |  | 6.00%
Default rate |  | 46.00%
Loss severity |  | 60.00%
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2007 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.20% | 6.20%
Default rate | 38.00% | 31.00%
Loss severity | 60.00% | 55.00%
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2007 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 6.90% | 7.00%
Default rate | 52.00% | 55.00%
Loss severity | 65.00% | 65.00%

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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- Details
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X
- 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=27724398&loc=SL6284381-111563 + Details
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