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Investments (Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Net Investment Income [Line Items] |  |
Gross investment income | $ 1,340 | $ 1,150
Less: Investment expenses | 86 | 91
Net investment income | 1,254 | 1,059
Fixed maturity securities |  |
Net Investment Income [Line Items] |  |
Gross investment income | 919 | 837
Equity securities |  |
Net Investment Income [Line Items] |  |
Gross investment income | 2 | 0
Mortgage loans |  |
Net Investment Income [Line Items] |  |
Gross investment income | 245 | 239
Policy loans |  |
Net Investment Income [Line Items] |  |
Gross investment income | 14 | 15
Limited partnerships and LLCs |  |
Net Investment Income [Line Items] |  |
Gross investment income | 74 | (13)
Cash, cash equivalents and short-term investments |  |
Net Investment Income [Line Items] |  |
Gross investment income | 61 | 50
Other assets |  |
Net Investment Income [Line Items] |  |
Gross investment income | $ 25 | $ 22

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