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Investments and Derivative Instruments Level 4 Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]    
Securities Loaned $ 151,000,000 $ 67,000,000
Securities Held as Collateral, at Fair Value 153,000,000 68,000,000
Interest-bearing Deposit Liabilities, Domestic 2,700,000,000 2,500,000,000
Secured Debt, Dollar Rolls 0 0
US Treasury Securities [Member]    
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]    
Available-for-sale Securities Pledged as Collateral 17,000,000 35,000,000
Fixed Maturities [Member]    
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]    
Available-for-sale Securities Pledged as Collateral 495,000,000 440,000,000
Other Liabilities [Member]    
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 490,000,000 445,000,000
Cash [Member]    
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items]    
Available-for-sale Securities Pledged as Collateral   $ 5,000,000