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Investment gains (losses) (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Summary of investment gains (losses) | Investment gains (losses) are summarized as follows (in millions).
| Second Quarter |  |  | First Six Months |
| 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Investment gains (losses): |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |
Increase in unrealized investment gains during the period on securities held at the end of the period | $ | 7,593 |  |  | $ | 17,252 |  |  | $ | 1,236 |  |  | $ | 29,711 |
Investment gains (losses) on securities sold during the period |  | (370 | ) |  |  | 6,633 |  |  |  | (417 | ) |  |  | (3,948 | )
|  | 7,223 |  |  |  | 23,885 |  |  |  | 819 |  |  |  | 25,763 |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  | 8 |  |  |  | 1 |  |  |  | 16 |  |  |  | 14 |
Gross realized losses |  | (8 | ) |  |  | (28 | ) |  |  | (55 | ) |  |  | (40 | )
Other |  | (859 | ) |  |  | (1 | ) |  |  | (851 | ) |  |  | (4 | )
| $ | 6,364 |  |  | $ | 23,857 |  |  | $ | (71 | ) |  | $ | 25,733 |

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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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- References No definition available. + Details
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