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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Net Investment Income [Line Items] |  |  |  |
Investment income, operating | $ 425 | $ 501 | $ 1,264 | $ 1,705
Investment expenses | (21) | (18) | (62) | (56)
Net investment income | 404 | 483 | 1,202 | 1,649
Net investment income (loss) recognized due to the change in fair value of equity and trading portfolio securities held as of September 30, 2022 and 2021 | (68) | (55) | (179) | (9)
Fixed maturity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, operating | 454 | 425 | 1,324 | 1,278
Limited partnership investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (losses) on investments, before investment expenses | (32) | 89 | (5) | 285
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (losses) on investments, before investment expenses | 2 | 4 | (7) | 53
Income (loss) from trading portfolio |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (losses) on investments, before investment expenses | (18) | (30) | (95) | 46
Other |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, operating | $ 19 | $ 13 | $ 47 | $ 43

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