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Accumulated other comprehensive income (Tables) | 3 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Schedule of accumulated other comprehensive income | A summary of the net changes in after-tax accumulated other comprehensive income attributable to Berkshire shareholders follows (in millions).
| Unrealized investment gains (losses) |  | Foreign currency translation |  | Long-duration insurance contracts |  | Defined benefit pension plans |  | Other |  | Total |
2025 |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the year | $ | 117 |  | $ | (7,039 | ) | $ | 2,015 |  | $ | 1,148 |  | $ | 175 |  | $ | (3,584 | )
Other comprehensive income |  | 30 |  |  | 474 |  |  | 28 |  |  | (38 | ) |  | 6 |  |  | 500 |
Balance at March 31, 2025 | $ | 147 |  | $ | (6,565 | ) | $ | 2,043 |  | $ | 1,110 |  | $ | 181 |  | $ | (3,084 | )
2024 |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the year | $ | 190 |  | $ | (5,393 | ) | $ | 1,353 |  | $ | (97 | ) | $ | 184 |  | $ | (3,763 | )
Other comprehensive income |  | (29 | ) |  | (523 | ) |  | 284 |  |  | 3 |  |  | (22 | ) |  | (287 | )
Balance at March 31, 2024 | $ | 161 |  | $ | (5,916 | ) | $ | 1,637 |  | $ | (94 | ) | $ | 162 |  | $ | (4,050 | )

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