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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Investment income, operating | $ 800 | $ 615 | $ 2,156 | $ 1,819
Investment expenses | (24) | (23) | (72) | (67)
Net investment income | 776 | 592 | 2,084 | 1,752
Net investment income (loss) recognized due to the change in fair value of equity and trading portfolio securities held | 108 | (14) | 123 | 3
Fixed maturity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, operating | 517 | 491 | 1,530 | 1,443
Limited partnership investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (losses) on investments, before investment expenses | 67 | 29 | 195 | 111
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, operating | 21 | 24 | 70 | 54
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (losses) on investments, before investment expenses | 21 | 9 | 56 | 42
Income from trading portfolio |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (losses) on investments, before investment expenses | 141 | 32 | 210 | 91
Other |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, operating | $ 33 | $ 30 | $ 95 | $ 78

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 + Details
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