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Investment gains (losses) (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of investment gains (losses) | Investment gains (losses) for each of the three years ending December 31, 2024 are summarized as follows (in millions).
|  | 2024 |  |  | 2023 |  |  | 2022 |
Investment gains (losses): |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |
Change in unrealized investment gains (losses) during the year on securities held at the end of the year |  | $ | 49,297 |  |  | $ | 69,144 |  |  | $ | (63,120 | )
Investment gains (losses) during the year on securities sold |  |  | 3,523 |  |  |  | 2,698 |  |  |  | (3,927 | )
|  |  | 52,820 |  |  |  | 71,842 |  |  |  | (67,047 | )
Fixed maturity securities: |  |  |  |  |  |  |  |  |
Gross realized gains |  |  | 28 |  |  |  | 139 |  |  |  | 134 |
Gross realized losses |  |  | (71 | ) |  |  | (86 | ) |  |  | (684 | )
Other |  |  | 22 |  |  |  | 2,960 |  |  |  | (302 | )
|  | $ | 52,799 |  |  | $ | 74,855 |  |  | $ | (67,899 | )

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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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