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Derivative Financial Instruments and Off-balance sheet Financial Instruments (Details 3) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
Cash flow hedge gain to be reclassified from AOCI during the next twelve months $ 2,000,000    
Net gain (loss) recognized in earnings during the reporting period representing the amount of the fair value of the hedges' ineffectiveness. 0 $ 0 $ 0
Gain recognized in OCI on derivatives during the period 0 10,000,000 12,000,000
Gain (loss) recognized in OCI on derivatives during the term of the hedging relationship 2,000,000 6,000,000 (2,000,000)
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Net investment income      
Derivative [Line Items]      
Investment Income, Net 1,000,000 (1,000,000) (2,000,000)
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Realized capital gains and losses      
Derivative [Line Items]      
Investment Income, Net $ 3,000,000 $ 3,000,000 $ (2,000,000)