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Investments - Net appreciation (decline) recognized in net income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | $ (245) | $ 117 | $ (763) | $ 585
Equity securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | (209) | (20) | (771) | 170
Limited partnership interests carried at fair value |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | $ (36) | $ 137 | $ 8 | $ 415

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