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Fair Value Measurements - Guaranteed Minimum Income Benefit Contracts (Details) (Guaranteed Minimum Income Benefit [Member], Ceded Credit Risk Secured [Member])
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Mar. 31, 2015
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Guaranteed Minimum Income Benefit [Member] | Ceded Credit Risk Secured [Member]
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| Ceded Credit Risk [Line Items] | |
| GMIB assets percent secured | 70.00% |