75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Statements of Net Assets Available for Benefits link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Statement of Changes in Net Assets Available for Benefits link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - Description of Plan link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - Summary of Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Termination of The Plan link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Tax Status link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - Related Party and Parties-in-Interest Transactions link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - Risks and Uncertainties link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - Schedule of Assets (Held at End of Year) link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - Summary of Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - Schedule of Assets (Held at End of Year) (Tables) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - Description of Plan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - Fair Value Measurements - Summary of Fair Value Hierarchy of Plan's Assets (Details) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - Fair Value Measurements - Summary of Fair Value of Investments Measured at NAV Per Share as Practical Expedient (Details) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - Tax Status - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75180 - Disclosure - Related Party and Parties-in-Interest Transactions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - Schedule of Assets (Held at End of Year) - Schedule of Assets (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - Schedule of Assets (Held at End of Year) - Schedule of Assets (Details) [Default] link:presentationLink link:calculationLink link:definitionLink EBP, Change in Net Asset Available for Benefit, Increase [Abstract] ADDITIONS TO NET ASSETS ATTRIBUTED TO: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefit payments to participants EBP, Employer, Common Stock, Class B [Member] Class B Common Stock EBP, Receivable [Abstract] Receivables Fair Value, Inputs, Level 2 [Member] Level 2 Inputs EBP, Related Party and Party-in-Interest Transactions [Line Items] Document Fiscal Period Focus EBP, Employer Contribution, Receivable Employer contributions EBP, Tax Status [Abstract] EBP, Description of Plan [Text Block] Description of Plan EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants Investment, Identifier [Axis] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses paid on behalf of the plan Administrative expenses EBP, Description of Plan [Line Items] EBP, Employer Contribution, Matching Percentage Matching contribution percentage EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Fair Value and NAV [Abstract] EBP, Liability [Abstract] Liabilities: EBP, Accounting Policy [Line Items] Berkshire Hathaway Stock Fund Berkshire Hathaway Stock Fund [Member] Berkshire Hathaway Stock Fund EBP, Schedule of Asset Held for Investment [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] Employee Benefit Plan Penalty Free Early Withdrawal Employee benefit plan penalty free early withdrawal. Employee benefit plan penalty free early withdrawal EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Employee benefit plan, notes receivable from participant, account, maximum borrowing, amount Common Collective Trust [Member] Common Collective Trust Funds Amendment Flag EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash, Total EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO: EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Employee benefit plan, notes receivable from participant, account, minimum borrowing, amount EBP, Payment to Participant [Policy Text Block] Benefits Paid to Participants EBP, Participant Contribution, Receivable Participant contributions EBP, Schedule of Asset Held for Investment [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Employer, Common Stock Fund [Member] Berkshire Hathaway Stock Fund Employee Benefit Plan Special Discretionary Contribution by Plan Sponsor Percentage Employee benefit plan special discretionary contribution by plan sponsor percentage. Employee benefit plan special discretionary contribution to be contributed by the Plan Sponsor EBP, Investment, Current Value, Type [Extensible Enumeration] Investment Type [Axis] Document Type Entity Central Index Key EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition EBP, Accounting Policy [Table] EBP, Basis of Accounting [Policy Text Block] Basis of Accounting Employee Benefit Plan Account Balance for Terminated Employees Employee benefit plan account balance for terminated employees. Employee benefit plan terminated employees account balance EBP, Investment, Plan Interest in Master Trust, Fair Value Total investments at fair value Investment in BNSF 401(k) Plans Master Trust (Note 4) EBP, Description of Plan [Table] EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment, Total Dividends and interest EBP, Investment, Fair Value [Abstract] Investments, at fair value: Number of shares held EBP, Investment, Number of Shares Minimum [Member] Minimum EBP, Related Party and Party-in-Interest Transactions [Text Block] Related Party and Parties-in-Interest Transactions EBP, Change in Net Asset Available for Benefit, Increase Total Additions Level 3 Inputs Fair Value, Inputs, Level 3 [Member] EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions EBP, Expense [Policy Text Block] Administrative Expenses Accrued expenses EBP, Accrued Expense Fair Value Measured at Net Asset Value Per Share [Member] Fair Value Measured at NAV per Share EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Tax Determination Letter, Date Tax determination letter, date EBP, Liability Total Liabilities EBP, Participant Contribution, Automatic, Deferral Rate Employee benefit plan automatic deferral rate Schwab Indexed Retirement Funds [Member] Schwab indexed retirement funds. Schwab Indexed Retirement Funds EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Ending Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Beginning Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Total Investments at fair value Fair Value EBP, Use of Estimate [Policy Text Block] Use of Estimates Employee Benefit Plan True Up Contributions Employee benefit plan true up contributions. True-up contributions Mutual Fund [Member] Mutual Funds Entity [Domain] Special discretionary contributions Employee Benefit Plan Special Discretionary Contributions Amount Employee benefit plan special discretionary contributions amount. Employee benefit plan maximum Annual catch up contribution limit amount. Employee Benefit Plan Maximum Annual Catch Up Contribution Limit Amount Employee benefit plan maximum annual catch-up contributions limit amount EBP, Summary of Accounting Policy [Text Block] Summary of Accounting Policies EBP 003 EBP 003 [Member] EBP 003 EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements EBP, Description of Plan and Accounting Change [Abstract] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Notes receivable from participants EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statistical Measurement [Domain] EBP, Note Receivable from Participant Notes receivable from participants Document Period End Date EBP, Risk and Uncertainty [Table] Fair Value Hierarchy and NAV [Domain] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Employee benefit plan, note receivable from participant, account, maximum borrowing, to total account, percentage Employee Benefit Plan Participant Contribution, Pretax, Super Maximum Annual Compensation, Amount Employee benefit plan participant contribution, pretax, super maximum annual compensation, amount. Employee benefit plan participant maximum annual contribution including super catch up contributions amount EBP, Tax Determination Letter, Obtained [true false] Tax determination letter, obtained Investment Excluding Common Collective Trust Funds [Member] Investment excluding common collective trust funds. Investment Excluding Common Collective Trust Funds EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Plan Termination [Text Block] Termination of The Plan Employee Benefit Plan Maximum Amount Withdrawal by Victim of Domestic Abuse Employee benefit plan maximum amount withdrawal by victim of domestic abuse. Maximum withdrawal without penalty by victim of domestic abuse EBP, Participant Contribution, Pretax, Maximum Annual Compensation, Amount Employee benefit plan participant maximum annual contribution including catch up contributions amount Cover [Abstract] Charles Schwab Bank [Member] Charles Schwab Bank. Schwab Investments [Domain] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment income: EBP, Risk and Uncertainty [Abstract] EBP, Fair Value, Investment, NAV, Redemption, Notice Period Plan Level Redemption Notice Period EBP, Net Asset Available for Benefit Net assets available for benefits from the financial statements Net assets available for benefits, end of year Net assets available for benefits, beginning of year Net Assets available for benefits EBP, Asset Held for Investment, Plan Interest in Master Trust, Current Value Current Value EBP, Investment, Fair Value and NAV [Table Text Block] Summary of Plan"s Investments at Fair and Plan's Assets and Fair Value of Investments Measured at Net Assets Value Per Share as Practical Expedient EBP, Schedule of Asset Held for Investment [Abstract] EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Employee benefit plan participant contribution vesting description. Employee Benefit Plan Participant Contribution Vesting Description Employee benefit plan contribution vesting description EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants EBP, Schedule of Asset Held for Investment [Table Text Block] Schedule of Assets EBP, Statement of Net Asset Available for Benefit [Table] Document Fiscal Year Focus EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment, Total Net realized/unrealized appreciation in fair value Net realized/unrealized appreciation in fair value of investments EBP, Employer Contribution, Participant Compensation Matched, Percentage Percentage on employee eligible compensation EBP, Statement of Change in Net Asset Available for Benefit [Table] Morley Stable Value Fund [Member] Morley stable value fund. Morley Stable Value Fund EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee benefit plan maximum annual compensation limitation percentage EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] Legal Entity [Axis] EBP, Plan Name EBP, Risk and Uncertainty [Line Items] EBP, Asset [Abstract] Assets: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Plan interest in BNSF 401(k) Plans Master Trust investment income (Note 4) Total Investment Income Employee Benefit Plan Fair Value Investment Net Asset Value Redemption Frequency Employee benefit plan fair value investment net asset value redemption frequency. Redemption Frequency (if currently eligible) Employee Benefit Plan Increase in Escalation Provision Percentage Employee benefit plan increase in escalation provision percentage. Employee benefit plan increase in escalation provision feature EBP, Investment, Fair Value and NAV [Table] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Participant rollover contributions EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Asset Held for Investment Total assets held for investment purposes EBP, Tax Status [Text Block] Tax Status Maximum [Member] Maximum Employee benefit plan maximum annual compensation limitation amount. Employee Benefit Plan Maximum Annual Compensation Limitation Amount Employee benefit plan maximum annual compensation limitation amount Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Percentage of maximum withdrawal by victim of domestic abuse Employee Benefit Plan Maximum Amount Withdrawal by Victim of Domestic Abuse Percentage Employee Benefit Plan Maximum Amount Withdrawal by Victim of domestic abuse percentage. Entity Registrant Name Total Receivables EBP, Receivable EBP, Asset Held for Investment, Participant Loan, Interest Rate Employee benefit plan, asset held for investment, participant loan, interest rate Employee benefit plan schedule of assets held at end of year. Employee Benefit Plan Schedule of Assets Held at End of Year [TextBlock] Schedule of Assets (Held at End of Year) EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Axis] EBP, Risk and Uncertainty [Text Block] Risks and Uncertainties Employee Benefit Plan Maximum Annual Super Catch Up Contribution Limit Amount Employee benefit plan maximum annual super catch up contribution limit amount. Employee benefit plan maximum annual super catch-up contribution limit amount EBP, Change in Net Asset Available for Benefit, Decrease Total Deductions Fair Value, Inputs, Level 1 [Member] Level 1 Inputs EBP, Tax Status [Line Items] Entity Tax Identification Number EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase in net assets available for benefits per the financial statements Net increase in net assets available for benefits EBP, Tax Status [Table] EBP, Asset Held for Investment, Party-in-Interest [true false] Baillie Gifford International Alpha K. Schwab Indexed RET 2015 [Member] Schwab Indexed RET 2060 [Member] Dodge & Cox Income X. Fidelity US Bond Index. Schwab Indexed RET 2015 Schwab Indexed RET 2020 [Member] Schwab Indexed RET 2020 [Member] Mainstay Large Cap Growth R1 Fidelity inflation-P ROT BD IND. Morley Stable Value FD Net 20 [Member] Schwab Indexed RET 2060 [Member] Fidelity International Inv [Member] Schwab Indexed RET 2065 [Member] PIMCO High Yield Fund Mainstay Large Cap Growth R1 [Member] Schwab Indexed RET 2040 [Member] Gabelli US Treasury DFA Global Real Estate SEC Hood River Small Cap Growth Ret Fidelity Inflation-P ROT BD IND [Member] Schwab Indexed RET 2050 [Member] Schwab Indexed RET 2025 PIMCO High Yield Fund [Member] Hood River Small Cap Growth Ret [Member] Fidelity 500 Index. Gabelli US Treasury [Member] Washington Mutual Fund R6 [Member] Schwab Indexed RET 2035 [Member] Schwab Indexed RET 2010 Vanguard INTL BD IDX ADM. Schwab Indexed RET 2040 Schwab Indexed RET 2050 Schwab Indexed RET 2045 [Member] Victory Small Co Opportunity I Fidelity 500 Index [Member] Schwab Indexed RET 2010 [Member] Cash Equivalents1 [Member] Schwab Indexed RET 2045 [Member] DFA Global Real Estate SEC [Member] Schwab Indexed RET 2030 [Member] Fidelity US Bond Index [Member] Schwab Indexed RET 2030 Fidelity Extended Market Index [Member] Schwab Indexed RET 2035 Schwab Indexed RET 2025 [Member] Baillie Gifford International Alpha K [Member] Dodge & Cox Income X [Member] Morley Stable Value FD Net 20 Fidelity international inv. Fidelity extended market index. Washington Mutual Fund R6 Cash Equivalents Schwab Indexed RET 2055 Victory Small Co Opportunity I [Member] Schwab Indexed RET 2065. Schwab Indexed RET 2055 [Member] Vanguard INTL BD IDX ADM [Member]