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Accumulated other comprehensive income (Tables) | 6 Months Ended
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Jun. 30, 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 Hathaway shareholders for the six months ending June 30, 2024 and 2023 follows (in millions).
| Unrealized gains (losses) on investments |  |  | Foreign currency translation |  |  | Long-duration insurance contracts |  |  | Defined benefit pension plans |  |  | Other |  |  | Total |
First six months of 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the year | $ | 190 |  |  | $ | (5,393 | ) |  | $ | 1,353 |  |  | $ | (97 | ) |  | $ | 184 |  |  | $ | (3,763 | )
Other comprehensive income |  | (22 | ) |  |  | (747 | ) |  |  | 684 |  |  |  | (1 | ) |  |  | (6 | ) |  |  | (92 | )
Balance at the end of the period | $ | 168 |  |  | $ | (6,140 | ) |  | $ | 2,037 |  |  | $ | (98 | ) |  | $ | 178 |  |  | $ | (3,855 | )
First six months of 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the year | $ | (187 | ) |  | $ | (6,142 | ) |  | $ | 1,541 |  |  | $ | (552 | ) |  | $ | 288 |  |  | $ | (5,052 | )
Other comprehensive income |  | 174 |  |  |  | 592 |  |  |  | 71 |  |  |  | 41 |  |  |  | (66 | ) |  |  | 812 |
Balance at the end of the period | $ | (13 | ) |  | $ | (5,550 | ) |  | $ | 1,612 |  |  | $ | (511 | ) |  | $ | 222 |  |  | $ | (4,240 | )

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