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Investment gains (losses) (Tables) | 3 Months Ended
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Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Summary of investment gains (losses) | Investment gains (losses) are summarized as follows (in millions).
| First Quarter |
| 2025 |  |  | 2024 |
Investment gains (losses): |  |  |  |  |
Equity securities: |  |  |  |  |
Increase (decrease) in unrealized investment gains during the period on securities held at the end of the period | $ | (6,775 | ) |  | $ | 3,982 |
Investment gains (losses) on securities sold during the period |  | 371 |  |  |  | (2,104 | )
|  | (6,404 | ) |  |  | 1,878 |
Fixed maturity securities: |  |  |  |  |
Gross realized gains |  | 8 |  |  |  | 13 |
Gross realized losses |  | (47 | ) |  |  | (12 | )
Other |  | 8 |  |  |  | (3 | )
| $ | (6,435 | ) |  | $ | 1,876 |

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- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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