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Investments - Problem and Potential Problem Commercial Mortgage Loans (Details) (Mortgage Loans on Real Estate [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2015
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Dec. 31, 2014
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Mortgage Loans on Real Estate [Member]
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| Financing Receivable, Modifications [Line Items] | ||
| Maximum past due days that the mortgage loans are considered current | 59 days | |
| Debt service coverage ratio threshold, below which mortgage loans are considered potential problems | 1.0 | |
| Loan-to-value ratio threshold, above which mortgage loans are considered potential problems | 100.00% | |
| Minimum past due days that mortgage loans are considered potential problems | 30 days | |
| Maximum past due days that mortgage loans are considered potential problems | 60 days | |
| Problem and potential problem mortgage loans | $ 134 | $ 208 |