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Retroactive reinsurance contracts (Tables) | 6 Months Ended
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Jun. 30, 2024
Insurance [Abstract] |
Reconciliation of changes in claim liabilities and incurred losses and loss adjustment expenses | Reconciliations of the changes in estimated liabilities for retroactive reinsurance unpaid losses and loss adjustment expenses for each of the six-month periods ended June 30, 2024 and 2023 follow (in millions).
| 2024 |  |  | 2023 |
Balance at the beginning of the year | $ | 34,647 |  |  | $ | 35,415 |
Incurred losses and loss adjustment expenses: |  |  |  |  |
Current contract year |  | 51 |  |  |  | — |
Prior contract years |  | (119 | ) |  |  | 15 |
Total |  | (68 | ) |  |  | 15 |
Paid losses and loss adjustment expenses |  | (1,066 | ) |  |  | (1,033 | )
Foreign currency effect |  | (19 | ) |  |  | 24 |
Balance at June 30 | $ | 33,494 |  |  | $ | 34,421 |
Incurred losses and loss adjustment expenses | $ | (68 | ) |  | $ | 15 |
Deferred charge amortization and adjustments |  | 431 |  |  |  | 416 |
Incurred losses and loss adjustment expenses included in the Consolidated Statements of Earnings | $ | 363 |  |  | $ | 431 |

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- Definition Schedule of liability for unpaid claims and claims adjustment expense and incurred losses and loss adjustment expenses retroactive reinsurance contracts. + References No definition available. + Details
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Namespace Prefix: | brka_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration