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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2007
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Maximum, Percentage |  | 200.00% |  |  |
Document Fiscal Year Focus |  | 2015 |  |  |
Health care cost trends, initial annual rate increase |  | 7.00% |  |  |
Health care cost trends, an ultimate trend rate |  | 4.50% |  |  |
Expected year when ultimate trend rate to be reached |  | 2021 |  |  |
Accumulated benefit obligation for pension plans |  | $ 35,320 | $ 35,867 |  |
Employer contributions |  | 1,229 | 1,258 | $ 212 |
Fair value of plan assets |  | $ 30,031 | $ 30,129 |  |
Plan assets target allocation |  | 100.00% | 100.00% |  |
U.S. Postretirement Medical Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Pension Plan, Liabilities |  | $ 2,445 | $ 2,522 |  |
Fair value of plan assets |  | $ 130 | 259 |  |
U.S. Postretirement Medical Benefits | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Postretirement medical plans service minimum eligibility year |  | 10 years |  |  |
Postretirement medical plans service minimum eligibility age |  | 55 years |  |  |
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 22 | 19 |  |
UPS/IBT Full-Time Employee Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Pension Plan, Liabilities |  |  |  |  | $ 1,701
Postretirement Medical Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | 111 | 122 |  |
International Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Pension Plan, Liabilities |  | 250 | 254 |  |
Fair value of plan assets |  | 1,014 | 1,042 |  |
Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 29,017 | $ 29,087 |  |
Domestic | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 0.00% | 0.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 5.00% | 5.00% |  |
Fair value of plan assets |  | $ 811 | $ 1,772 |  |
International [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 1,014 | $ 1,042 |  |
International [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 0.00% | 0.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 5.00% | 5.00% |  |
Fair value of plan assets |  | $ 25 | $ 32 |  |
Fixed Income Securities [Member] | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 25.00% | 15.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 35.00% | 35.00% |  |
Fair value of plan assets |  | $ 8,199 | $ 8,848 |  |
Fixed Income Securities [Member] | International [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 15.00% | 15.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 35.00% | 35.00% |  |
Fair value of plan assets |  | $ 221 | $ 227 |  |
Equity securities | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 35.00% | 25.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 55.00% | 55.00% |  |
Fair value of plan assets |  | $ 12,048 | $ 10,634 |  |
Equity securities | International [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 50.00% | 50.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 65.00% | 65.00% |  |
Fair value of plan assets |  | $ 448 | $ 463 |  |
Other Investments [Member] | Private Equity and Real Estate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unfunded commitments to limited partnerships |  | $ 1,855 |  |  |
Other Investments [Member] | Private Equity and Real Estate | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Redemption notice period, lower limit |  | 10 years |  |  |
Other Investments [Member] | Private Equity and Real Estate | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Redemption notice period, upper limit |  | 15 years |  |  |
Other Investments [Member] | Hedge Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unfunded commitments to limited partnerships |  | $ 234 |  |  |
Other Investments [Member] | Domestic | Hedge Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 5.00% | 8.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 15.00% | 15.00% |  |
Fair value of plan assets |  | $ 3,617 | $ 3,595 |  |
Other Investments [Member] | Domestic | Other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | [1] | 1.00% | 1.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | [1] | 10.00% | 10.00% |  |
Other Investments [Member] | Domestic | Structured Products(1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 1.00% | 3.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 10.00% | 10.00% |  |
Fair value of plan assets |  | $ 1,848 | $ 1,766 |  |
Other Investments [Member] | Domestic | Structured Products [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | [2] | 0.00% | 0.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | [2] | 5.00% | 5.00% |  |
Fair value of plan assets | [2] | $ 324 |  |  |
Other Investments [Member] | International [Member] | Other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [1] | $ 209 | $ 212 |  |
Other Investments [Member] | International [Member] | Structured Products(1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 0.00% | 0.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  | 17.00% | 17.00% |  |
Fair value of plan assets |  | $ 111 | $ 108 |  |
Other Investments [Member] | International [Member] | Structured Products [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | [2] | 0.00% | 0.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | [2] | 10.00% | 10.00% |  |
Change in Assumptions for Pension Plans [Member] | U.S. Postretirement Medical Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | $ 51 |  |  |
Change in Assumptions for Pension Plans [Member] | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | 383 |  |  |
Change in Assumptions for Pension Plans [Member] | Other Postretirement Benefit Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | 234 |  |  |
Defined Contribution Money Purchase Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions charged to expense |  | 83 | $ 82 | 80 |
Employee Defined Contribution Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions charged to expense |  | $ 104 | $ 95 | $ 90 |
Discounted Employee Stock Purchase Modified Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Exercisable Price Percentage Of Closing Price Of Another Class Of Stock |  | 95.00% |  |  |
Central States, South East & South West Areas Health and Welfare Fund |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation |  |  |  |  | $ 6,100
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[2] | Represents mortgage and asset-backed securities.

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- Definition Assets, 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 non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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