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Investments, Investment Gains (Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment Gains (Losses) [Abstract]      
Investment gains (losses) [1] $ (1,246) $ 49 $ (57)
Gross investment gains on available-for-sale securities 220 125 168
Gross investment losses on available-for-sale securities 220 131 164
Fixed Maturity Securities [Member]      
Investment Gains (Losses) [Abstract]      
Investment gains (losses)   (6) 4
Equity Securities [Member]      
Investment Gains (Losses) [Abstract]      
Investment gains (losses) (3) 66 (74)
Derivative Instruments [Member]      
Investment Gains (Losses) [Abstract]      
Investment gains (losses) (10) (11) 9
Short Term Investments and Other [Member]      
Investment Gains (Losses) [Abstract]      
Investment gains (losses) (22)   $ 4
Diamond Offshore [Member]      
Investment Gains (Losses) [Abstract]      
Deconsolidation loss (1,211)    
Nonredeemable Preferred Stock [Member]      
Investment Gains (Losses) [Abstract]      
Investment gains (losses) $ (3) $ 66  
[1] Gross investment gains on available-for-sale securities were $220, $125 and $168 for the years ended December 31, 2020, 2019 and 2018. Gross investment losses on available-for-sale securities were $220, $131 and $164 for the years ended December 31, 2020, 2019 and 2018. For the year ended December 31, 2020, $3 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of December 31, 2020. For the year ended December 31, 2019, $66 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of December 31, 2019.