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Investments and Derivative Instruments Level 4 Other-Than-Temporary Impairment Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other-Than-Temporary Impairment Losses [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ 102 $ 59 $ 73
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Held-to-maturity Securities 29 37 32
Other-Than-Temporary Impairment Losses [Roll Forward]      
Other than Temporary Impairment, as of Jan. 1 (424) (552) (1,013)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment [1] (15) (15) (19)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses [1] 14 22 13
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 68 138 469
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status 2 0 2
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 102 59 73
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows 59 27 22
Other than Temporary Impairment, as of Dec. 31 (324) (424) (552)
Available-for-sale Securities [Member]      
Other-Than-Temporary Impairment Losses [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities 54 17 26
Equity Securities [Member]      
Other-Than-Temporary Impairment Losses [Roll Forward]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 16 2 15
Other Equity Securities [Member]      
Other-Than-Temporary Impairment Losses [Roll Forward]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 3 $ 3 $ 0
[1] These additions are included in the net OTTI losses recognized in earnings in the Consolidated Statements of Operations.