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 - Statements 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 Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - Fair Value of Measurements link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Plan Termination link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Tax Status link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - Risks and Uncertainties link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - Related Parties and Party-in-Interest Transactions link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - Reconciliation of Financial Statements to Form 5500 link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - Schedule of Assets (Held at End of Year) link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - Description of Plan (Tables) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - Fair Value of Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - Reconciliation OF Financial Statements to Form 5500 (Tables) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - Schedule of Assets (Held at End of Year) (Tables) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - Description of Plan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75180 - Disclosure - Description of Plan - Schedule of Matching Contributions Fully Vested (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - Fair Value Measurements - Summary of Plan"s Investments at Fair based on Valuation Inputs (Details) link:presentationLink link:calculationLink link:definitionLink 75200 - Disclosure - Plan Termination - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75210 - Disclosure - Tax Status - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75220 - Disclosure - Related Parties and Party-in-Interest Transactions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75230 - Disclosure - Reconciliation of Financial Statements to Form 5500 - Summary of Reconciliation of Net Assets Available for Benefits from the Financial Statements to the Form 5500 (Details) link:presentationLink link:calculationLink link:definitionLink 75240 - Disclosure - Reconciliation of Financial Statements to Form 5500 - Summary of Reconciliation of Net Increase in Net Assets Available for Benefits from Financial Statements to Form 5500 (Details) link:presentationLink link:calculationLink link:definitionLink 75250 - Disclosure - Schedule of Assets (Held at End of Year) - Schedule of Assets (Details) link:presentationLink link:calculationLink link:definitionLink 75250 - 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: 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 Employee benefit plan mandatory lump sum distributions transferred to individual retirement account. Employee Benefit Plan Mandatory Lump Sum Distributions Transferred to Individual Retirement Account Employee benefit plan mandatory lump sum distributions transferred to individual retirement account Vanguard Retirement Savings Trust III [Member] Vanguard Retirement Savings Trust III VRSTIII Fair Value, Inputs, Level 2 [Member] Level 2 Employee Benefit Plan Employer Contribution Vested Percentage In Five Years Employee benefit plan employer contribution vested percentage in five years. Years of Service, Five EBP, Related Party and Party-in-Interest Transactions [Line Items] Document Fiscal Period Focus Years of Service, Three Employee Benefit Plan Employer Contribution Vested Percentage In Three Years Employee benefit plan employer contribution vested percentage in three years. EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Employee benefit plan, forfeitures to fund employer contributions EBP, Form 5500 Caption, Net Income (Loss) Net increase in net assets available for benefits per the Form 5500 Net increase in net assets available for benefits per the Form 5500 EBP, Tax Status [Abstract] EBP, Forfeited Nonvested Account Employee benefit plan, forfeited non-vested 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 from notes receivable from participants Investment, Identifier [Axis] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses Fees paid by Plan to parties-in-interest EBP, Description of Plan [Line Items] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Fair Value and NAV [Abstract] EBP, Accounting Policy [Line Items] EBP, Schedule of Asset Held for Investment [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] Years of Service, Six Employee Benefit Plan Employer Contribution Vested Percentage In Six Years Employee benefit plan employer contribution vested percentage in six years. EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Employee benefit plan, notes receivable from participant, account, maximum borrowing, amount Employee Benefit Plan Other additions to Net Assets Employee Benefit Plan Other additions to Net Assets. Other additions Years of Service, Two Employee Benefit Plan Employer Contribution Vested Percentage In Two Years Employee benefit plan employer contribution vested percentage in two years. Common Collective Trust [Member] Common/Collective Trusts Amendment Flag EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash, Total Employers EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions from net assets: 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] Payment of Benefits EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution Change in delinquent loans reported as distributions for tax purposes and as Plan assets for financial reporting purposes EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution, Total Employee Benefit Plan Employer Contribution Vested Percentage In Four Years Employee benefit plan employer contribution vested percentage in four years. Years of Service, Four EBP, Schedule of Asset Held for Investment [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Employer, Common Stock Fund [Member] Berkshire Hathaway Class B Common Stock Fund EBP, Investment, Current Value, Type [Extensible Enumeration] Investment Type [Axis] Employee Benefit Plan Participant Contribution Annual Automatic Increase in Deferral Rate Employee benefit plan participant contribution annual automatic increase in deferral rate Employee benefit plan participant contribution annual automatic increase in deferral rate Document Type Entity Central Index Key EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Employee benefit plan, forfeitures to pay expenses EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition EBP, Accounting Policy [Table] EBP, Basis of Accounting [Policy Text Block] Basis of Accounting EBP, Description of Plan [Table] EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment, Total Interest and dividends Net assets available for benefits from the Form 5500 EBP, Form 5500 Caption, Net Assets Net assets available for benefits from the Form 5500 Minimum [Member] Minimum EBP, Related Party and Party-in-Interest Transactions [Text Block] Related Parties and Party-in-Interest Transactions EBP, Change in Net Asset Available for Benefit, Increase Total additions to net assets Fair Value, Inputs, Level 3 [Member] Level 3 EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price Sales amount EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Expense [Policy Text Block] Administrative Expenses EBP, Contribution [Table Text Block] Schedule of Matching Contributions become Fully Vested Net Asset Value Fair Value Measured at Net Asset Value Per Share [Member] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participants Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Level 1 2 and 3 EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Tax Determination Letter, Date Tax determination letter, date EBP, Participant Contribution, Automatic, Deferral Rate Employee benefit plan, participant contribution, automatic, deferral rate EBP, Related Party and Party-in-Interest Transactions [Abstract] Investments, at fair value 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 Total investments at fair value EBP, Use of Estimate [Policy Text Block] Use of Estimates Mutual Fund [Member] Mutual Funds Entity [Domain] EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Purchases amount EBP, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements EBP, Description of Plan and Accounting Change [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Reconciliation of Net Assets 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] Employee benefit plan, notes receivable from participant prime rate Employee Benefit Plan, Notes Receivable from Participant, Prime Rate Employee benefit plan, notes receivable from participant, prime rate. EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Employee benefit plan, notes receivable from participant, account, maximum borrowing, to total account, percentage EBP, Tax Determination Letter, Obtained [true false] Tax determination letter, obtained EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Plan Termination [Text Block] Plan Termination Employee Benefit Plan, Notes Receivable from Participants Loan Term Employee benefit plan, notes receivable from participants loan term. Employee benefit plan, notes receivable from participants loan term Cover [Abstract] 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, Net Asset Available for Benefit End of year Beginning of year Net assets available for benefits per the financial statements Net Assets Available for Benefits EBP, Investment, Fair Value and NAV [Table Text Block] Summary of Plan"s Investments at Fair based on Valuation Inputs Years of Service, Less than two Employee Benefit Plan Employer Contribution Vested Percentage Less Than Two Years Employee benefit plan employer contribution vested percentage less than two years. EBP, Net Asset Available for Benefit [Abstract] Net assets available for benefits: 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 Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] 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 Net appreciation in fair value of investments 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 EBP, Employer Contribution, Participant Compensation Matched, Percentage Percentage on employee eligible compensation EBP, Statement of Change in Net Asset Available for Benefit [Table] Contributions EBP, Contribution [Policy Text Block] Money Market Fund Money Market Funds [Member] EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] Legal Entity [Axis] EBP, Plan Name EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution Delinquent loans reported as distributions for tax purposes and as Plan assets for financial reporting purposes 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 EBP, Investment, Fair Value and NAV [Table] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Participant rollovers EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Asset Held for Investment Total assets held for investment purposes EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Tax Status [Text Block] Tax Status Maximum [Member] Maximum Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Entity Registrant Name EBP 002. EBP 002 [Member] EBP 002 EBP, Asset Held for Investment, Participant Loan, Interest Rate Employee benefit plan, asset held for investment, participant loan, interest rate Employee benefit plan, notes receivable from participants, 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, Reconciliation of Financial Statement to Form 5500 [Text Block] Reconciliation of Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Risks and Uncertainties EBP, Risk and Uncertainty [Text Block] Employee Benefit Plan, Plan Termination, Participants Percentage Vested in Accounts Employee benefit plan, plan termination, participants percentage vested in accounts. Percentage vested by participants, if Plan is terminated EBP, Change in Net Asset Available for Benefit, Decrease Total deductions from net assets Fair Value, Inputs, Level 1 [Member] Level 1 Employee benefit plan immediate lump sum distributions transferred to individual retirement account. Employee Benefit Plan Immediate Lump Sum Distributions Transferred to Individual Retirement Account Employee benefit plan immediate lump sum distributions transferred to individual retirement account EBP, Tax Status [Line Items] Entity Tax Identification Number EBP, Asset Held for Investment, Participant Loan, Maturity Date Employee benefit plan participant loan maturity date 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 EBP, Tax Status [Table] EBP, Asset Held for Investment, Party-in-Interest [true false] Vanguard MassMutual Allspring MassMutual [Member] Berkshire Allspring [Member] Berkshire [Member] Vanguard [Member]