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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 [Member]) | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
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%
Default rate |  | 8.00%
Loss severity |  | 50.00%
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%
Default rate |  | 17.00%
Loss severity |  | 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 | 6.50% | 6.00%
Default rate | 11.00% | 9.00%
Loss severity | 50.00% | 50.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2006 [Member] | Maximum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate | 7.40% | 6.90%
Default rate | 12.00% | 16.00%
Loss severity | 50.00% | 50.00%
Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2007 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate |  | 6.50%
Default rate |  | 14.00%
Loss severity |  | 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%
Default rate |  | 25.00%
Loss severity |  | 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, Alt-A Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Discount rate |  | 5.60%
Default rate |  | 15.00%
Loss severity |  | 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%
Default rate |  | 25.00%
Loss severity |  | 65.00%
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%
Default rate |  | 38.00%
Loss severity |  | 60.00%
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%
Default rate |  | 52.00%
Loss severity |  | 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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