| Line | Label | Object Class | Period Type | Balance | Name | 
| 1 |  00100 - Statement - Condensed Consolidated Statement of Income | [Network] | http://www.exxonmobil.com/taxonomy/role/StatementCondensedConsolidatedStatementOfIncome | ||
| 2 |  Condensed Consolidated Statement of Income | [Abstract] | us-gaap:IncomeStatementAbstract | ||
| 3 |  REVENUES AND OTHER INCOME | [Abstract] | us-gaap:RevenuesAbstract | ||
| 4 |  Sales and other operating revenue | [Concept] Monetary | For Period | Credit | xom:SalesAndOtherOperatingRevenueIncludingSalesBasedTaxes | 
| 5 |  Income from equity affiliates | [Concept] Monetary | For Period | Credit | us-gaap:IncomeLossFromEquityMethodInvestments | 
| 6 |  Other income | [Concept] Monetary | For Period | Credit | us-gaap:OtherIncome | 
| 7 |  Total revenues and other income | [Concept] Monetary | For Period | Credit | xom:TotalRevenuesAndOtherIncome | 
| 8 |  COSTS AND OTHER DEDUCTIONS | [Abstract] | us-gaap:CostsAndExpensesAbstract | ||
| 9 |  Crude oil and product purchases | [Concept] Monetary | For Period | Debit | xom:CrudeOilAndProductPurchases | 
| 10 |  Production and manufacturing expenses | [Concept] Monetary | For Period | Debit | xom:ProductionAndManufacturingExpenses | 
| 11 |  Selling, general and administrative expenses | [Concept] Monetary | For Period | Debit | us-gaap:SellingGeneralAndAdministrativeExpense | 
| 12 |  Depreciation and depletion | [Concept] Monetary | For Period | Debit | us-gaap:DepreciationDepletionAndAmortization | 
| 13 |  Exploration expenses, including dry holes | [Concept] Monetary | For Period | Debit | us-gaap:ExplorationExpense | 
| 14 |  Interest expense | [Concept] Monetary | For Period | Debit | us-gaap:InterestExpense | 
| 15 |  Sales-based taxes | [Concept] Monetary | For Period | Debit | us-gaap:ExciseAndSalesTaxes | 
| 16 |  Other taxes and duties | [Concept] Monetary | For Period | Debit | us-gaap:TaxesOther | 
| 17 |  Total costs and other deductions | [Concept] Monetary | For Period | Debit | us-gaap:CostsAndExpenses | 
| 18 |  Income before income taxes | [Concept] Monetary | For Period | Credit | us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 
| 19 |  Income taxes | [Concept] Monetary | For Period | Debit | us-gaap:IncomeTaxExpenseBenefit | 
| 20 |  Net income including noncontrolling interests | [Concept] Monetary | For Period | Credit | us-gaap:ProfitLoss | 
| 21 |  Net income attributable to noncontrolling interests | [Concept] Monetary | For Period | Debit | us-gaap:NetIncomeLossAttributableToNoncontrollingInterest | 
| 22 |  Net income attributable to ExxonMobil | [Concept] Monetary | For Period | Credit | us-gaap:NetIncomeLoss | 
| 23 |  Earnings per common share (dollars) | [Concept] Share | For Period | us-gaap:EarningsPerShareBasic | |
| 24 |  Earnings per common share - assuming dilution (dollars) | [Concept] Share | For Period | us-gaap:EarningsPerShareDiluted | |
| 25 |  Dividends per common share (dollars) | [Concept] Share | For Period | us-gaap:CommonStockDividendsPerShareCashPaid |