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Investments - Impaired 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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Mar. 31, 2014
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Dec. 31, 2014
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Mortgage Loans on Real Estate [Member]
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| Financing Receivable, Impaired [Line Items] | |||
| Impaired commercial mortgage loans with related allowance, gross | $ 83 | $ 147 | |
| Impaired commercial mortgage loans with no related allowance, gross | 31 | 31 | |
| Impaired commercial mortgage loans, gross | 114 | 178 | |
| Impaired commercial mortgage loans, reserves | (8) | (12) | |
| Impaired commercial mortgage loans with related allowance, net | 75 | 135 | |
| Impaired commercial mortgage loans, net | 106 | 166 | |
| Average recorded investment in impaired mortgage loans | 146 | 120 | |
| Interest income on non-accrual commercial mortgage loans that would have been recognized if original terms had been met | |||
| Interest income on impaired commercial mortgage loans | |||