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Investment Holding Level 4 Repurchase Agreements, Dollar Roll Transactions and Other (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral $ 46  
Reverse Repurchase Agreements Segregated under Other Regulations 0  
Securities Loaned 750,000,000 $ 435,000,000
Security Owned and Pledged as Collateral, Associated Liabilities, Fair Value 742,000,000 420,000,000
Securities Received as Collateral 26,000,000 0
Fixed Maturities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral 200,000,000 112,000,000
Cash [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral   0
Other Liabilities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 197,000,000 118,000,000
US Treasury Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral $ 21,000,000 $ 15,000,000