2.2.0.25falsefalse40302 - Disclosure - Miscellaneous Financial Information (Crude Oil, Products and Merchandise) (Details)truefalsefalse1falsefalseUSDfalsefalse12/31/2010
USD ($)
USD ($) / shares
$As_Of_12_31_2010http://www.sec.gov/CIK0000034088instant2010-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse12/31/2009
USD ($)
USD ($) / shares
$As_Of_12_31_2009http://www.sec.gov/CIK0000034088instant2009-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$5false0xom_PetroleumProductsInventoryxomfalsedebitinstantCarrying value of petroleum products.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse35000000003500000000falsetruefalsefalsefalse2truefalsefalse32000000003200000000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying value of petroleum products.No authoritative reference available.falsefalse6false0xom_CrudeOilInventoryxomfalsedebitinstantCarrying value of crude oilfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse38000000003800000000falsefalsefalsefalsefalse2truefalsefalse32000000003200000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying value of crude oilNo authoritative reference available.falsefalse7false0xom_ChemicalProductsInventoryxomfalsedebitinstantCarrying value of chemical products.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse21000000002100000000falsefalsefalsefalsefalse2truefalsefalse20000000002000000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying value of chemical products.No authoritative reference available.falsefalse8false0xom_NaturalGasAndOtherProductsInventoryxomfalsedebitinstantCarrying value of natural gas and other productsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse500000000500000000falsefalsefalsefalsefalse2truefalsefalse300000000300000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying value of natural gas and other productsNo authoritative reference available.falsefalse9false0us-gaap_InventoryFinishedGoodsAndWorkInProcessus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse98520000009852000000falsetruefalsefalsefalse2truefalsefalse87180000008718000000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregated amount of merchandise or goods held by the entity that are readily available for future sale and items held by the entity which are partially complete or in the process of being readied for future sale.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5
truefalse25Miscellaneous Financial Information (Crude Oil, Products and Merchandise) (Details) (USD $)NoRoundingUnKnownUnKnownUnKnownfalsetrue
