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Investments and Derivative Instruments Level 4 Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions (Details) - USD ($)
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]      
Securities Loaned $ 0   $ 0
Securities Held as Collateral, at Fair Value 0    
Secured Debt, Repurchase Agreements 0    
Interest-bearing Deposit Liabilities, Domestic 0   $ 0
Fixed Maturities [Member]      
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]      
Available-for-sale Securities Pledged as Collateral $ 249,000,000    
Other Liabilities [Member]      
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]      
Assets Sold under Agreements to Repurchase, Repurchase Liability   $ 249,000,000