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Retroactive reinsurance contracts (Tables) | 12 Months Ended
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Dec. 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 years ended December 31, 2024 follow (in millions).
| 2024 |  |  | 2023 |  |  | 2022 |
Balance at the beginning of the year | $ | 34,647 |  |  | $ | 35,415 |  |  | $ | 37,855 |
Losses and loss adjustment expenses incurred |  | 247 |  |  |  | 1,109 |  |  |  | 86 |
Losses and loss adjustment expenses paid |  | (2,399 | ) |  |  | (1,934 | ) |  |  | (2,358 | )
Foreign currency effect |  | (52 | ) |  |  | 57 |  |  |  | (168 | )
Balance at December 31 | $ | 32,443 |  |  | $ | 34,647 |  |  | $ | 35,415 |
Losses and loss adjustment expenses incurred above | $ | 247 |  |  | $ | 1,109 |  |  | $ | 86 |
Deferred charge adjustments |  | 698 |  |  |  | 375 |  |  |  | 769 |
Losses and loss adjustment expenses incurred, including deferred charge adjustments | $ | 945 |  |  | $ | 1,484 |  |  | $ | 855 |

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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
Name: | brka_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAndIncurredLossesAndLossAdjustmentExpensesRetroactiveReinsuranceContractsTableTextBlock
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