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Investments (Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Net Investment Income [Line Items] |  |
Gross investment income | $ 1,150 | $ 1,192
Less: Investment expenses | 91 | 41
Net investment income | 1,059 | 1,151
Fixed maturity securities |  |
Net Investment Income [Line Items] |  |
Gross investment income | 837 | 718
Mortgage loans |  |
Net Investment Income [Line Items] |  |
Gross investment income | 239 | 203
Policy loans |  |
Net Investment Income [Line Items] |  |
Gross investment income | 15 | 15
Limited partnerships and LLCs |  |
Net Investment Income [Line Items] |  |
Gross investment income | (13) | 241
Cash, cash equivalents and short-term investments |  |
Net Investment Income [Line Items] |  |
Gross investment income | 50 | 1
Other |  |
Net Investment Income [Line Items] |  |
Gross investment income | $ 22 | $ 14

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