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on of the expected postretirement benefit obligation attributed to that employee's service rendered to that date; on and after the full eligibility date, the accumulated and expected postretirement benefit obligations for an employee are the same.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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alsetruefalse6truefalsefalse-13000000-13falsefalsefalsetruefalse7truefalsefalse-12000000-12falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
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falsefalse00falsefalsefalsetruefalse4truefalsefalse1700000017falsefalsefalsetruefalse5truef
alsefalse1600000016falsefalsefalsetruefalse6truefalsefalse10000001falsefalsefalsetruefalse7truefalsefalse10000001falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of contributions made by plan participants. Under a contributory plan active employees or retirees contribute part of the cost. In some contributory plans, those wishing to be covered must contribute; in others, the contributions result in increased benefits.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse8false0us-gaap_DefinedBenefitPlanPlanAmendmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse-7000000-7falsefalsefalsetruefalse3truefalsefalse10000001falsefalsefalsetruefalse4truefalsefalse80000008falsefalsefalsetruefalse5truefalsefalse-21000000-21falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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nus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1falsefalsefalse00fa
lsefalsefalsefalsefalse2truefalsefalse2134200000021342falsefalsefalsetruefalse3truefalsefalse1776300000017763falsefalsefalsetruefalse4truefalsefalse35970000003597falsefalsefalsetruefalse5truefalsefalse33360000003336falsefalsefalsetruefalse6truefalsefalse680000000680falsefalsefalsetruefalse7truefalsefalse575000000575falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetary1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. The projected benefit obligation is measured using assumptions as to future compensation levels if the pension benefit formula is based on those future compensation levels (pay-related, final-pay, final-average-pay, or career-average-pay plans). For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obli
gation and the projected benefit obligation are the same. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. Prior to an employee's full eligibility date, the accumulated postretirement benefit obligation as of a particular date for an employee is the portion of the expected postretirement benefit obligation attributed to that employee's service rendered to that date; on and after the full eligibility date, the accumulated and expected postretirement benefit obligations for an employee are the same.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAssets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those nonbenefit obligations may be considered as reductions of plan assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 264
Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
falsefalse22false0ups_DefinedBenefitPlanOtherupsfalsedebitdurationDefined Benefit Plan, Otherfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7truefalsefa
lse30000003falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryDefined Benefit Plan, OtherNo authoritative reference available.falsefalse23false0us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse2032500000020325falsetruefalsefalsefalse2truefalsefalse2009200000020092falsetruefalsetruefalse3truefalsefalse1535100000015351falsetruefalsetruefalse4truefalsefalse233000000233falsetruefalsetruefalse5truefalsefalse298000000298falsetruefalsetruefalse6truefalsefalse561000000561falsetruefalsetruefalse7truefalsefalse481000000481falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAssets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those nonbenefit obligations may be considered as reductions of plan assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d(iv)(b)(i)
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 49
falsefalse722Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
