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Investments, Investment Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investment Gains (Losses) [Abstract]        
Investment gains (losses) [1] $ (1,142) $ 2 $ (1,358) $ 33
Gross investment gains on available-for-sale securities 102 28 131 64
Gross investment losses on available-for-sale securities 85 31 189 73
Fixed Maturity Securities [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses) 17 (3) (58) (9)
Equity Securities [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses) 63 11 (70) 53
Derivative Instruments [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses) (10) (6) (5) (11)
Short Term Investments and Other [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses) (1)   (14)  
Diamond Offshore [Member]        
Investment Gains (Losses) [Abstract]        
Deconsolidation loss (1,211)   (1,211)  
Nonredeemable Preferred Stock [Member]        
Investment Gains (Losses) [Abstract]        
Recognized gains (losses) on securities $ 63 $ 11 $ (70) $ 53
[1] Gross investment gains on available-for-sale securities were $102 and $28 for the three months ended June 30, 2020 and 2019 and $131 and $64 for the six months ended June 30, 2020 and 2019. Gross investment losses on available-for-sale securities were $85 and $31 for the three months ended June 30, 2020 and 2019 and $189 and $73 for the six months ended June 30, 2020 and 2019. During the three and six months ended June 30, 2020, $63 of investment gains and $70 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of June 30, 2020. During the three and six months ended June 30, 2019, $11 and $53 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of June 30, 2019.