Maximum contribution, percent in broader open-end fund EBP, Participant Contributions, Maximum Contribution, Percent in Broader Open-End Fund EBP, Participant Contributions, Maximum Contribution, Percent in Broader Open-End Fund Total investments at fair value EBP, Investment, Fair Value Rollover contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Other EBP, Other Investment [Member] Sales EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Pretax, maximum qualified pay, percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage BrokerageLink - self directed EBP, Self-Directed Brokerage Account [Member] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] EBT Total EBP Total [Member] EBP Total Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Notes receivable from participants EBP, Change in Net Asset Available for Benefit, Decrease from Notes Receivable from Participants EBP, Change in Net Asset Available for Benefit, Decrease from Notes Receivable from Participants Accrued fees and other EBP, Accrued Expense Money market funds Money Market Funds [Member] Plan Interest EBP, Nonconsolidated, Plan Interest in Master Trust [Member] Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Investment, Fair Value and NAV [Abstract] Archaea Employee Savings Plan (Plan No. 101) EBP 101 [Member] EBP 101 BP Partnership Savings Plan (Plan No. 051) EBP 051 [Member] EBP 051 Total assets EBP, Asset Excess Contributions Payable EBP, Excess Contribution Payable [Policy Text Block] Net increase in net assets after transfers Net increase in net assets after transfer per the financial statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) After Transfer To (From) Plan EBP, Change in Net Asset Available for Benefit, Increase (Decrease) After Transfer To (From) Plan Assets: EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] ADDITIONS: Additions of assets attributed to: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Transfers into the Plan / Plan Merger (Note 1) Plan mergers EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Total liabilities EBP, Liability EBP, Master Trust [Line Items] EBP, Master Trust [Line Items] Less: Certain deemed distributions of participant loans EBP, Reconciliation to Form 5500, Payment to Participant, Increase (Decrease) from Deemed Distribution Amendment Flag Amendment Flag Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment in the BP Master Trust for Employee Savings Plans EBP, Investment, Plan Interest in Master Trust, Fair and Contract Value Receivables: EBP, Receivable [Abstract] EBP, Description of Plan and Accounting Change [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Concentration of investment, amount EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Total Investments, Amount Scenario [Domain] Scenario [Domain] Minimum service period EBP, Requisite Service Period EBP, Requisite Service Period Investments [Domain] Investments [Domain] EBP, Master Trust [Abstract] Use of Estimates EBP, Use of Estimate [Policy Text Block] Pending transactions EBP, Pending Transactions, Receivable EBP, Pending Transactions, Receivable Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] Transfers EBP, Transfers Policy [Policy Text Block] EBP, Transfers Policy Adjustment from contract value to fair value for fully benefit responsive investment contracts EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Contract Value to Current Value RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] Company contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Minimum Minimum [Member] Dividends and interest EBP, Investment Income, Receivable EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type Investment Type [Axis] Investment Type [Axis] Interest on notes receivable from participants Repayments of notes receivable and interest from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Non-U.S. equity funds Private Equity Funds, Non-US [Member] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Non-U.S. bond funds Bond Funds, Non-US [Member] Bond Funds, Non-US Interest, dividends and other EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF THE PLANS EBP, Description of Plan [Text Block] Retirement age EBP, Retirement Age EBP, Retirement Age EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Minimum crediting interest rate EBP, Investment, Interest Rate Minimum EBP, Investment, Interest Rate Minimum Adjustment from contract value to fair value for fully benefit responsive investment contracts EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] Basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Employer contribution percentage EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase BP Employee Savings Plan (Plan No. 001) EBP 001 [Member] EBP 001 Fund management fees EBP, Change in Net Asset Available for Benefit, Decrease from Fund ManagementFees EBP, Change in Net Asset Available for Benefit, Decrease from Fund ManagementFees Short term investment fund Short-Term Investments [Member] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Adjustment from contract value to fair value for fully benefit responsive investment contracts, prior year EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Prior Period, Increase from Deemed Distribution EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Prior Period, Increase from Deemed Distribution Benefit responsive investment contracts at contract value EBP, Investment, Contract Value General loan, borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Document Information [Line Items] Document Information [Line Items] BP DirectSave Plan (Plan No. 052) EBP 052 [Member] EBP 052 EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] Qualified elective contributions EBP, Qualified Non-Elective Contributions [Member] EBP, Qualified Non-Elective Contributions EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] MASTER TRUST EBP, Master Trust [Text Block] Scenario [Axis] Scenario [Axis] Principal residence, borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Matched percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Observable (Level 2) Fair Value, Inputs, Level 2 [Member] BPX Energy Employee Savings Plan (Plan No. 100) EBP 100 [Member] EBP 100 Pending transactions, net EBP, Pending Transaction, Payable EBP, Pending Transaction, Payable U.S. bond funds Bond Funds, US [Member] Bond Funds, US Net increase after transfer per the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase in net assets during the year EBP, Change in Net Asset Available for Benefit, Increase (Decrease) RELATED PARTY TRANSACTIONS AND EXEMPT PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] Total investments EBP, Investment, Fair and Contract Value EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Investments at fair value: EBP, Investment, Fair Value [Abstract] Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Target date funds Target Date Funds [Member] Target Date Funds Earned dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefits paid to participants Benefits paid to participants per the financial statements EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Total EBP, Investment, Plan Interest in Master Trust, Fair Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] BP ADS ADR [Member] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] U.S. equity funds Private Equity Funds, US [Member] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Employer contribution percentage, tranche two EBP, Employer Contribution Vesting Percentage Tranche Two EBP, Employer Contribution Vesting Percentage Tranche Two EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Benefits paid to participants per Form 5500 EBP, Form 5500 Caption, Benefit Payment and Payments to Provide Benefits RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Participant loan, current value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] EBP, Master Trust [Table] EBP, Master Trust [Table] Total investments, at fair value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type Entity Central Index Key Entity Central Index Key Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common/collective trust funds Common Collective Trust [Member] Net assets available for benefits: EBP, Net Asset Available for Benefit [Abstract] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] DEDUCTIONS: Deductions of assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Master Trust EBP, Nonconsolidated, Master Trust [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Schedule of Master Trust Net Assets EBP, Master Trust [Table Text Block] Purchases EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Accounts payable: EBP, Liability [Abstract] EBP, Subsequent Event [Abstract] SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] Forecast Forecast [Member] FEDERAL INCOME TAX STATUS EBP, Tax Status [Text Block] Maximum borrowing, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Concentration of investment, percentage EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Total Investments, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] Note Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Vesting period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period Net investment income – BP Master Trust for Employee Savings Plans EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Unobservable (Level 3) Fair Value, Inputs, Level 3 [Member] Net assets available for benefits Beginning of year End of year Net assets available for benefits as stated in the financial statements EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested account EBP, Forfeited Nonvested Account Net assets available for benefits as stated in the Form 5500 EBP, Form 5500 Caption, Net Assets Investments measured at NAV: Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Vesting period, tranche two EBP, Employer Contribution Vesting Service Period, Tranche Two EBP, Employer Contribution Vesting Service Period, Tranche Two Participant compensation matched, percentage EBP, Employer Contribution to Master Trust, Participant Compensation Matched, Percentage EBP, Employer Contribution to Master Trust, Participant Compensation Matched, Percentage EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]