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Accumulated other comprehensive income (Tables) | 12 Months Ended
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Dec. 31, 2024
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 for each of the three years ending December 31, 2024 follows (in millions).
|  | Unrealized investment gains (losses) |  | Foreign currency translation |  | Long-duration insurance contracts |  | Defined benefit pension plans |  | Other |  | Total |
Balance at December 31, 2021 |  | $ | 369 |  | $ | (4,092 | ) | $ | (4,096 | ) | $ | (347 | ) | $ | 43 |  | $ | (8,123 | )
Other comprehensive income |  |  | (991 | ) |  | (2,047 | ) |  | 5,637 |  |  | (298 | ) |  | 283 |  |  | 2,584 |
Reclassifications into net earnings |  |  | 435 |  |  | (3 | ) |  | — |  |  | 93 |  |  | (38 | ) |  | 487 |
Balance at December 31, 2022 |  |  | (187 | ) |  | (6,142 | ) |  | 1,541 |  |  | (552 | ) |  | 288 |  |  | (5,052 | )
Other comprehensive income |  |  | 420 |  |  | 741 |  |  | (188 | ) |  | 466 |  |  | (25 | ) |  | 1,414 |
Reclassifications into net earnings |  |  | (43 | ) |  | 8 |  |  | — |  |  | (11 | ) |  | (79 | ) |  | (125 | )
Balance at December 31, 2023 |  |  | 190 |  |  | (5,393 | ) |  | 1,353 |  |  | (97 | ) |  | 184 |  |  | (3,763 | )
Other comprehensive income |  |  | (43 | ) |  | (1,647 | ) |  | 662 |  |  | 1,222 |  |  | 2 |  |  | 196 |
Reclassifications into net earnings |  |  | (30 | ) |  | 1 |  |  | — |  |  | 23 |  |  | (11 | ) |  | (17 | )
Balance at December 31, 2024 |  | $ | 117 |  | $ | (7,039 | ) | $ | 2,015 |  | $ | 1,148 |  | $ | 175 |  | $ | (3,584 | )

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