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Significant business acquisitions and other transactions (Tables) | 12 Months Ended
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Dec. 31, 2024
Business Acquisition [Line Items] |
Summary of unaudited pro forma consolidated earnings | Certain unaudited pro forma revenue and consolidated earnings (loss) data for the year ended December 31, 2022 as if the Alleghany and Pilot acquisitions were completed on the same terms at the beginning of 2022 follows (in millions, except per share amounts).
| 2022 |
Revenues | $ | 383,115 |
Net earnings (loss) attributable to Berkshire shareholders |  | (23,947 | )
Net earnings (loss) per equivalent Class A common share |  | (16,303 | )
Pilot [Member] |
Business Acquisition [Line Items] |
Summary of preliminary values of identified assets acquired and liabilities assumed | A summary of the values of Pilot’s assets acquired, liabilities assumed and noncontrolling interests as of January 31, 2023 follows (in millions).
Assets acquired |  |  |  | Liabilities assumed and noncontrolling interests |
Property, plant and equipment | $ | 8,015 |  |  | Notes payable | $ | 5,876 |
Goodwill* |  | 6,605 |  |  | Other liabilities |  | 4,918 |
Other intangible assets |  | 6,853 |  |  | Liabilities assumed |  | 10,794 |
Other assets |  | 7,047 |  |  | Noncontrolling interests, predominantly redeemable |  | 3,361 |
|  |  |  | Liabilities assumed and noncontrolling interests | $ | 14,155 |
Assets acquired | $ | 28,520 |  |  | Net assets | $ | 14,365 |
—————— * Goodwill from this acquisition is expected to be deductible for income tax purposes.

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(2) -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(3) -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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