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Investments, (Components of Net Investment Gains (Losses) - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Gain (Loss) on Securities [Line Items] |  |
Net investment gains (losses) | $ (96) | $ (68)
Foreign Exchange |  |
Gain (Loss) on Securities [Line Items] |  |
Net investment gains (losses) | $ 2 | $ (16)

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