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Investments (Supplemental Net Investment Gains (Losses)) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Changes in estimated fair value subsequent to purchase of equity securities still held at the end of the respective periods and recognized in net investment gains (losses) | $ (19) | $ 17 | $ 11 | $ 58
Realized gains (losses) on investments sold or disposed | (195) | (20) | (330) | (566)
Foreign currency gains (losses) | (120) | (27) | (165) | 14
Net realized investment gains (losses) from sales and disposals of investments | (129) | 21 | (196) | (487)
Net investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net realized investment gains (losses) from sales and disposals of investments | 66 | 41 | 134 | 79
Cash Flow Hedging |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Realized gains (losses) on investments sold or disposed | 0 | (27) | 0 | (22)
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Changes in estimated fair value subsequent to purchase of equity securities still held at the end of the respective periods and recognized in net investment gains (losses) | $ (15) | $ 31 | $ 17 | $ 20

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