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Accumulated other comprehensive income (Tables) | 12 Months Ended
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Dec. 31, 2023
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 each of the three years ending December 31, 2023 follows (in millions).
|  | Unrealized gains (losses) on investments |  | Foreign currency translation |  | Long-duration insurance contracts |  | Defined benefit pension plans |  | Other |  | Total |
Balance at December 31, 2020 |  | $ | 536 |  | $ | (3,082 | ) | $ | — |  | $ | (1,645 | ) | $ | (52 | ) | $ | (4,243 | )
Adoption of ASU 2018-12 |  |  | — |  |  | — |  |  | (5,751 | ) |  | — |  |  | — |  |  | (5,751 | )
Balance at January 1, 2021 |  |  | 536 |  |  | (3,082 | ) |  | (5,751 | ) |  | (1,645 | ) |  | (52 | ) |  | (9,994 | )
Other comprehensive income |  |  | (167 | ) |  | (1,010 | ) |  | 1,655 |  |  | 1,298 |  |  | 95 |  |  | 1,871 |
Balance at December 31, 2021 |  |  | 369 |  |  | (4,092 | ) |  | (4,096 | ) |  | (347 | ) |  | 43 |  |  | (8,123 | )
Other comprehensive income |  |  | (556 | ) |  | (2,050 | ) |  | 5,637 |  |  | (205 | ) |  | 245 |  |  | 3,071 |
Balance at December 31, 2022 |  |  | (187 | ) |  | (6,142 | ) |  | 1,541 |  |  | (552 | ) |  | 288 |  |  | (5,052 | )
Other comprehensive income |  |  | 377 |  |  | 749 |  |  | (188 | ) |  | 455 |  |  | (104 | ) |  | 1,289 |
Balance at December 31, 2023 |  | $ | 190 |  | $ | (5,393 | ) | $ | 1,353 |  | $ | (97 | ) | $ | 184 |  | $ | (3,763 | )

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