Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Effects of One Basis Point Change on Projected Benefit Obligation (Details)

v2.4.1.9
COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Effects of One Basis Point Change on Projected Benefit Obligation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Pension Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Effect of One Percentage Point Increase on Projected Benefit Obligation $ (65)ups_DefinedBenefitPlanEffectofOnePercentagePointIncreaseonProjectedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Defined Benefit Plan, Effect of One Percentage Point Decrease on Projected Benefit Obligation 69ups_DefinedBenefitPlanEffectofOnePercentagePointDecreaseonProjectedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Other Postretirement Benefit Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Effect of One Percentage Point Increase on Projected Benefit Obligation (3)ups_DefinedBenefitPlanEffectofOnePercentagePointIncreaseonProjectedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Defined Benefit Plan, Effect of One Percentage Point Decrease on Projected Benefit Obligation 3ups_DefinedBenefitPlanEffectofOnePercentagePointDecreaseonProjectedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Change in Assumptions for Pension Plans | U.S. Pension Benefits  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 1,119us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ChangeInAssumptionsForPensionPlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Change in Assumptions for Pension Plans | U.S. Postretirement Medical Benefits  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 51us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ChangeInAssumptionsForPensionPlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Change in Assumptions for Pension Plans | Pension Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 383us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ChangeInAssumptionsForPensionPlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Change in Assumptions for Pension Plans | Other Postretirement Benefit Plan, Defined Benefit [Member]  
effects of one-basis point change one PBO [Line Items]  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) $ 234us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ChangeInAssumptionsForPensionPlansMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember