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Common stock - Narrative (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) Vote shares | Dec. 31, 2023 shares | Dec. 31, 2022 shares | Dec. 31, 2021 shares
Class of Stock [Line Items] |  |  |  |
Preferred Stock, shares authorized | 1,000,000 |  |  |
Preferred Stock, shares issued | 0 |  |  |
Economic equivalent of Class B share to Class A share | 0.0667% |  |  | 0.0667%
Common Stock Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares repurchase, authorization description | Berkshire’s common stock repurchase program, as amended, permits Berkshire to repurchase shares any time that Warren Buffett, Berkshire’s Chairman of the Board and Chief Executive Officer, believes that the repurchase price is below Berkshire’s intrinsic value, conservatively determined. |  |  |
Minimum cash, cash equivalents and U.S. Treasury Bill threshold after repurchase of common stock shares, amount | $ | $ 30,000,000,000 |  |  |
Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of votes entitled per share, number | Vote | 1 |  |  |
Shares outstanding | 547,562 | 567,775 | 591,564 | 617,113
Class B [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of votes entitled per share, number | Vote | 0.0001 |  |  |
Number of shares of Class B stock obtainable from converting one Class A share | 1,500 |  |  |
Shares outstanding | 1,335,992,139 | 1,310,561,508 | 1,302,254,076 | 1,290,474,503
Equivalent Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares outstanding | 1,438,223 | 1,441,483 |  |

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