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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule of Investments [Line Items] |  |
Net realized gains (losses) | $ 28 | $ (7)
Proceeds from Sale of Debt Securities, Available-for-sale | 1,548 | 2,228
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 400 | 1,400
Not Designated as Hedging Instrument |  |
Schedule of Investments [Line Items] |  |
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax | 2 | (7)
Non-qualifying foreign currency derivatives | (2) | 5
Realized Investment Gains Losses |  |
Schedule of Investments [Line Items] |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 36 | 2
Other, net |  |
Schedule of Investments [Line Items] |  |
Other, net | (3) | (15)
Total Fixed Maturities, AFS |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Realized Gain | 5 | 17
Gross losses on sales of fixed maturities | (11) | (39)
Change in ACL on fixed maturities, AFS | (1) | (5)
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Equity Securities, FV-NI, Realized Gain (Loss) | (12) | 50
Equity Securities, FV-NI, Unrealized Gain (Loss) | 47 | (15)
Equity securities | 35 | 35
Mortgages [Member] |  |
Schedule of Investments [Line Items] |  |
Change in ACL on mortgage loans | $ 3 | $ 0

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