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Investments in equity securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of investments in equity securities | Investments in equity securities are summarized as follows (in millions).
|  | Cost Basis |  |  | Net Unrealized Gains |  |  | Fair Value |
December 31, 2024 |  |  |  |  |  |  |  |  |
Banks, insurance and finance |  | $ | 15,707 |  |  | $ | 75,936 |  |  | $ | 91,643 |
Consumer products |  |  | 12,658 |  |  |  | 92,091 |  |  |  | 104,749 |
Commercial, industrial and other |  |  | 47,141 |  |  |  | 28,055 |  |  |  | 75,196 |
|  | $ | 75,506 |  |  | $ | 196,082 |  |  | $ | 271,588 |
December 31, 2023 |  |  |  |  |  |  |  |  |
Banks, insurance and finance |  | $ | 27,136 |  |  | $ | 51,176 |  |  | $ | 78,312 |
Consumer products |  |  | 34,248 |  |  |  | 166,895 |  |  |  | 201,143 |
Commercial, industrial and other |  |  | 48,032 |  |  |  | 26,355 |  |  |  | 74,387 |
|  | $ | 109,416 |  |  | $ | 244,426 |  |  | $ | 353,842 |

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