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Investments and Derivative Instruments Level 4 Other-Than-Temporary Impairment Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other-Than-Temporary Impairment Losses [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) $ 11 $ 7 $ 23 $ 29
Other-Than-Temporary Impairment Losses [Roll Forward]        
Balance as of beginning of period (412) (488) (424) (531)
Additions for credit impairments recognized on securities not previously impaired [1] 0 (1) (3) (8)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses [1] 1 3 1 14
Securities that matured or were sold during the period 6 40 10 73
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status 0 0 2 0
Securities due to an increase in expected cash flows 19 7 28 13
Balance as of end of period $ (388) $ (488) $ (388) $ (488)
[1] These additions are included in the net OTTI losses recognized in earnings in the Condensed Consolidated Statements of Operations.