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Investments - Interest and Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 855 | $ 680 | $ 1,636 | $ 1,354
Investment expense | (72) | (62) | (143) | (125)
Interest and investment income | 783 | 618 | 1,493 | 1,229
Fixed maturity securities, available-for-sale |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 561 | 464 | 1,096 | 912
Equity securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 8 | 7 | 18 | 15
Preferred securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 10 | 15 | 18 | 28
Mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 65 | 57 | 131 | 108
Invested cash and short-term investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 53 | 34 | 100 | 67
Limited partnerships |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Limited partnerships | 98 | 45 | 151 | 103
Tax deferred property exchange income |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 34 | 40 | 66 | 83
Other investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 26 | $ 18 | $ 56 | $ 38

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