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Retroactive reinsurance contracts (Tables) | 3 Months Ended
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Mar. 31, 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 three-month periods ended March 31, 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 |  | — |  |  |  | 14 |
Total |  | 51 |  |  |  | 14 |
Paid losses and loss adjustment expenses |  | (408 | ) |  |  | (372 | )
Foreign currency effect |  | (45 | ) |  |  | 6 |
Balance at March 31 | $ | 34,245 |  |  | $ | 35,063 |
Incurred losses and loss adjustment expenses | $ | 51 |  |  | $ | 14 |
Deferred charge amortization and adjustments |  | 177 |  |  |  | 171 |
Incurred losses and loss adjustment expenses included in the Consolidated Statements of Earnings | $ | 228 |  |  | $ | 185 |

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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