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Investments (Sales or Disposals and Impairments of Fixed Maturity and Equity Securities) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fixed Maturity Securities        
Debt Securities, Available-for-sale [Line Items]        
Proceeds $ 20,183 $ 12,486 $ 39,253 $ 26,947
Gross investment gains 149 117 255 259
Gross investment losses (195) (72) (396) (216)
Total OTTI losses recognized in earnings:        
Total OTTI losses recognized in earnings 0 (3) 0 (3)
Net investment gains (losses) (46) 42 (141) 40
Equity Securities        
Total OTTI losses recognized in earnings:        
Total OTTI losses recognized in earnings 0 (5) 0 (13)
Net investment gains (losses) $ 34 $ 0 $ 3 $ 35