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Investments - Major Sources of Interest and Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |
Gross investment income | $ (2,864) | $ (2,088) | $ (2,128)
Investment expense | (257) | (197) | (167)
Interest and investment income | 2,607 | 1,891 | 1,961
Fixed maturity securities, available-for-sale |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | (1,911) | (1,489) | (1,267)
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | (33) | (31) | (23)
Preferred securities |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | (52) | (67) | (63)
Mortgage loans |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | (229) | (186) | (131)
Invested cash and short-term investments |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | (151) | (61) | (7)
Limited partnerships |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | (231) | (110) | (589)
Tax deferred property exchange income |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | (166) | (103) | (16)
Other investments |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | $ (91) | $ (41) | $ (32)

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