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Investments (Sales or Disposals and Impairments of Fixed Maturity and Equity Securities) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fixed Maturity Securities        
Debt Securities, Available-for-sale [Line Items]        
Proceeds $ 19,003 $ 8,586 $ 58,256 $ 35,742
Gross investment gains 234 364 489 623
Gross investment losses (111) (80) (507) (298)
Total OTTI losses recognized in earnings:        
Total OTTI losses recognized in earnings (17) (5) (17) (7)
Net investment gains (losses) 106 279 (35) 318
Equity Securities        
Total OTTI losses recognized in earnings:        
Total OTTI losses recognized in earnings 0 (4) 0 (17)
Net investment gains (losses) $ 18 $ 2 $ 21 $ 38