Statistical Measurement [Domain] Statistical Measurement [Domain] Related Party and Party in Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Document Information [Line Items] Document Information [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] EBP, Description of Plan and Accounting Change [Abstract] Transfers-in at fair value EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Investment Type [Axis] Investment Type [Axis] Other receivables EBP, Other Receivable Number of shares/units (in shares) EBP, Investment, Number of Shares Income Tax Status EBP, Tax Status [Text Block] Payables for cash collateral on securities on loan EBP, Investment Liability, Fair Value Total liabilities EBP, Liability EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Pioneer 401(k) Plan Merger EBP, Description of Plan Amendment [Text Block] Minimum annual compensation to total compensation, percentage EBP, Participant Contribution, Minimum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Minimum Annual Contribution to Eligible Compensation, Percentage EMSP 334 EBP EMSP 334 [Member] EBP EMSP 334 EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] PARTICIPANT LOANS EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] Vesting period EBP, Employer Contribution Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Expenses EBP, Expense [Policy Text Block] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Payables and accrued liabilities EBP, Accrued Expense EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Other investments EBP, Other Investment [Member] par/units EBP, Investment, Par or Maturity Value Maturity period EBP, Assets Held For Investment, Participant Loan, Maturity Period EBP, Assets Held For Investment, Participant Loan, Maturity Period Net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Net Asset Available for Benefit EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Total assets EBP, Asset EBP, Asset U.S. Government Securities U.S. GOVERNMENT SECURITIES US Treasury and Government [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Tax Status [Abstract] Net increase/(decrease) EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Cover [Abstract] Maximum Maximum [Member] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Assets EBP, Asset [Abstract] Minimum Minimum [Member] EBP, Schedule of Asset Held for Investment [Abstract] Dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Aggregate Bond Fund Common Collective Trust, Aggregate Bond Fund [Member] Common Collective Trust, Aggregate Bond Fund Entity [Domain] Entity [Domain] EBP, Asset Held for Investment EBP, Asset Held for Investment Investment, Identifier [Axis] Investment, Identifier [Axis] EBP, Investment, Fair Value and NAV [Abstract] Matching percentage EBP, Employer Contribution, Matching Percentage Basis of Accounting EBP, Basis of Accounting [Policy Text Block] Risks and Uncentainties EBP, Risk and Uncertainty [Policy Text Block] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Investments, at fair value (Note 5): EBP, Investment, Fair Value [Abstract] Maximum vesting age EBP, Employer Contribution Maximum Vesting Age Maximum Vesting age of participant for company contribution and/ or investment earning in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Amendment Flag Amendment Flag COMMON/COLLECTIVE TRUSTS Common Collective Trust [Member] Interest EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment S&P 500 Fund Common Collective Trust, S&P 500 Fund [Member] Common Collective Trust, S&P 500 Fund Common/Collective trusts (at net asset value) Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Benefit payments EBP, Change in Net Asset Available for Benefit, Decrease CURRENT VALUE EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, employer contribution vesting percentage EBP, Employer Contribution Vesting Percentage Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Statement of Net Asset Available for Benefit [Abstract] Description of the Plan EBP, Description of Plan [Text Block] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] World Ex-US Equity Fund Common Collective Trust, World Ex-US Equity Fund [Member] Common Collective Trust, World Ex-US Equity Fund EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Entity Central Index Key Entity Central Index Key Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Legal Entity [Axis] Legal Entity [Axis] Net investment income/(loss) EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] coupon EBP, Investment, Interest Rate Short term investments Common Collective Trust, Short Term Investments [Member] Common Collective Trust, Short Term Investments Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Document Type Document Type EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP Pioneer EBP Pioneer [Member] EBP Pioneer EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Percentage of market value of securities required for collateral EBP, Investment, Market Value Of Collateral Held, Percentage Value Threshold Of Securities On Loan EBP, Investment, Market Value Of Collateral Held, Percentage Value Threshold Of Securities On Loan Use of Estimates EBP, Use of Estimate [Policy Text Block] Small & Mid Cap Fund Common Collective Trust, Small & Mid Cap Fund [Member] Common Collective Trust, Small & Mid Cap Fund Statistical Measurement [Axis] Statistical Measurement [Axis] Percentage of market value of securities required for collateral denominated in different currencies EBP, Investment, Market Value Of Collateral Held, Percentage Value Threshold Of Securities On Loan In Different Currencies EBP, Investment, Market Value Of Collateral Held, Percentage Value Threshold Of Securities On Loan In Different Currencies Notes receivable from participants EBP, Note Receivable from Participant Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Table Text Block] Net appreciation/(depreciation) in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Investments [Domain] Investments [Domain] Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Maximum Annual Contribution to Eligible Compensation, Percentage Document Information [Table] Document Information [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Other investments on loan Other Security Investments [Member] Quoted Prices In Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Entity Registrant Name Entity Registrant Name Investment income/(loss): EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Tax Status [Table] EBP, Tax Status [Table] Exxon Mobil Corporation common stock Common Stock [Member] Liabilities EBP, Liability [Abstract] Receivables: EBP, Receivable [Abstract] Corporate Debt Securities CORPORATE DEBT SECURITIES Corporate Debt Securities [Member] Value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Total receivables EBP, Receivable Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage