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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Accumulated actuarial losses of benefit plans17false 4us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse00falsefalsefalse2truefalsefalse00falsefalsefalse3truefalsefalse10000001falsefalsefalse4truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryNet of tax amount of the income statement impact of the reclassification adjustment for actuarial (gains) losses recognized as a component of net periodic benefit cost.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 true2Amortization of actuarial losses18false 4dxm_OtherComprehensiveIncomeDefinedBenefitPlansSettlementAdjustmentNetOfTaxdxm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse00falsefalsefalse2truefalsefalse10000001falsefalsefalse3truefalsefalse00falsefalsefalse4truefalsefalse10000001falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the net of tax amount of settlement adjustments, of the increase (decrease) in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans included in net income.No definition available.true2Settlement losses19false 4dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTaxdxm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedTotalLabel1truefalsefalse00falsefalsefalse2truefalsefalse10000001falsefalsefalse3truefalsefalse10000001falsefalsefalse4truefalsefalse10000001falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the net of tax amount of reclassification adjustments, of the increase (decrease) in accumulated other comprehensive income (loss) included in net income related to pension and other postretirement benefit plans.No definition available.true2Total reclassifications included in net income (loss)20false 4us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParentus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedTotalLabel1truefalsefalse-7000000-7falsefalsefalse2truefalsefalse00falsefalsefalse3truefalsefalse-6000000-6falsefalsefalse4truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryNet of tax and reclassification adjustments amount of the increase (decrease) in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans, attributable to the parent entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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