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Investments - Net appreciation (decline) recognized in net income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | $ 51 | $ (505) | $ 114 | $ (556)
Equity securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | 19 | (511) | 66 | (600)
Limited partnership interests carried at fair value |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total | $ 32 | $ 6 | $ 48 | $ 44

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