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Investments (Details 5) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Investments [Abstract]        
Impairment write-downs $ (11) $ (6) $ (30) $ (22)
Change in intent write-downs (32) (39) (62) (104)
Net OTTI losses recognized in earnings (43) (45) (92) (126)
Sales 146 290 362 437
Valuation and settlements of derivative instruments 5 (5) (23) (17)
Total realized capital gains and losses 108 240 247 294
Fixed income and equity securities        
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 194 347 471 513
Gross loss on sales of fixed income securities $ 46 $ 27 $ 121 $ 63