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Investment Holding Level 4 Repurchase Agreements, Dollar Roll Transactions and Other (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral $ 37 $ 0
Interest-bearing Deposit Liabilities, Domestic 2,600 2,500
Securities Held as Collateral, at Fair Value 1,549 500
Securities Received as Collateral 0 0
Securities Loaned 1,512 488
Fixed Maturities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral 517 241
Other Liabilities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 527 248
US Treasury Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Available-for-sale Securities Pledged as Collateral $ 103 $ 102