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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