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Investments, Investment Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investment Gains (Losses) [Abstract]          
Investment gains (losses) [1]   $ 578 $ (1,142) $ 635 $ (1,358)
Gross investment gains on available-for-sale securities   51 102 109 131
Gross investment losses on available-for-sale securities   20 85 40 189
Fixed Maturity Securities [Member]          
Investment Gains (Losses) [Abstract]          
Investment gains (losses)   31 17 69 (58)
Equity Securities [Member]          
Investment Gains (Losses) [Abstract]          
Investment gains (losses)   17 63 19 (70)
Derivative Instruments [Member]          
Investment Gains (Losses) [Abstract]          
Investment gains (losses)   (12) (10) 5 (5)
Short Term Investments and Other [Member]          
Investment Gains (Losses) [Abstract]          
Investment gains (losses)   2 (1) 2 (14)
Altium Packaging [Member] | Sale of Interest [Member]          
Investment Gains (Losses) [Abstract]          
Investment gains (losses)   555   555  
Percentage interest of subsidiary sold 47.00%        
Diamond Offshore [Member]          
Investment Gains (Losses) [Abstract]          
Investment gains (losses)   (15) (1,211) (15) (1,211)
Nonredeemable Preferred Stock [Member]          
Investment Gains (Losses) [Abstract]          
Recognized gains (losses) on securities   $ 15 $ 63 $ 15 $ (70)
[1] Gross investment gains on available-for-sale securities were $51 and $102 for the three months ended June 30, 2021 and 2020 and $109 and $131 for the six months ended June 30, 2021 and 2020. Gross investment losses on available-for-sale securities were $20 and $85 for the three months ended June 30, 2021 and 2020 and $40 and $189 for the six months ended June 30, 2021 and 2020. During the three and six months ended June 30, 2021, $15 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of June 30, 2021. 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.