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Investments (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Investments        
Impairment write-downs $ (6) $ (33) $ (22) $ (43)
Change in intent write-downs (39) (27) (104) (54)
Net other-than-temporary impairment losses recognized in earnings (45) (60) (126) (97)
Sales 290 408 437 580
Valuation and settlements of derivative instruments (5) 14 (17) 10
Total realized capital gains and losses 240 362 294 493
Fixed income and equity securities
       
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 347 468 513 651
Gross loss on sales of fixed income securities $ 27 $ 63 $ 63 $ 84