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Investment Holding Level 4 Repurchase Agreements, Dollar Roll Transactions and Other (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]    
Secured Debt, Dollar Rolls $ 0 $ 0
Interest-bearing Deposit Liabilities, Domestic 2,600,000,000 2,500,000,000
Securities Held as Collateral, at Fair Value 114,000,000 68,000,000
Securities Received as Collateral 57,000,000  
Securities Loaned 168,000,000 67,000,000
Fixed Maturities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral 358,000,000 440,000,000
Cash [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral   5,000,000
Other Liabilities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 356,000,000 445,000,000
US Treasury Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral $ 75,000,000 $ 35,000,000