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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Benefit Expense and Other Changes in Policy Reserves (Details) - FIA embedded derivatives, included in contractholder funds | 12 Months Ended
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Sep. 30, 2016
Minimum [Member] |
Schedule of Benefits and Other Changes in Policy Reserves [Line Items] |
Interest Crediting Rates for Funds at Subsidiaries | 0.00%
Maximum |
Schedule of Benefits and Other Changes in Policy Reserves [Line Items] |
Interest Crediting Rates for Funds at Subsidiaries | 6.00%

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