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Investment Holding Level 4 Repurchase Agreements, Dollar Roll Transactions and Other (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]    
Secured Debt, Dollar Rolls $ 0 $ 0
Securities Loaned 77 15
Security Owned and Pledged as Collateral, Associated Liabilities, Fair Value 22 15
Securities Received as Collateral 57  
Fixed Maturities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral 229 249
Other Liabilities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 227 249
US Treasury Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral $ 15 $ 14