v3.26.1
Related Party And Party-in-interest Transactions - Additional Information (Details) - EBP 002 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Fair value of investments $ 1,696,168,778 $ 1,621,592,006
Fund appreciated by assets 187,712,727  
Berkshire B Unitized Stock Fund    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Fair value of investments 93,000,188 95,101,885
Stock investment portion 9,869,989  
Participant Directed Investments | Berkshire B ESOP Fund - Stock    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Fair value of investments 615,234,016 $ 615,066,467
Fund appreciated by assets $ 66,069,247