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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.

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