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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail) Employee in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) Employee | Dec. 31, 2016 USD ($) Employee | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Employee | Dec. 31, 2015 USD ($) | Dec. 31, 2007 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, actuarial gain |  |  | $ 569 |  |  |
Defined benefit plan, curtailment |  |  | 1,525 |  |  |
Defined benefit plan net actuarial loss |  |  | $ 956 |  |  |
Return on plan assets |  |  | 2.75% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Maximum, Percentage |  |  | 200.00% |  |  |
Number of covered persons | Employee | 22 | 22 |  | 22 |  |
Pension and postretirement benefit expense |  |  | $ 1,643 | $ 3,725 | $ 1,189 |
Health care cost trends, initial annual rate increase |  |  | 6.50% |  |  |
Health care cost trends, an ultimate trend rate |  |  | 4.50% |  |  |
Expected year when ultimate trend rate to be reached |  |  | 2022 |  |  |
Accumulated benefit obligation for pension plans | $ 39,488 | $ 39,488 | $ 45,776 | 39,488 |  |
Employer contributions | 685 |  | 7,794 | 2,668 | 1,229 |
Fair value of plan assets | 0 | 0 | $ 8 | $ 0 |  |
Plan assets target allocation |  |  | 100.00% | 100.00% |  |
Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer contributions |  |  |  | $ 22 |  |
U.S. Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate |  |  | 0.32% |  |  |
Postretirement Medical Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer contributions |  |  | $ 93 | 98 |  |
Domestic |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 8 | 0 |  |
Domestic | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 0 | 0 |  |
International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 0 | 0 |  |
International [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 |  | 0 |  |
Fixed Income Securities [Member] | Domestic |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 8 | 0 |  |
Fixed Income Securities [Member] | International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 0 | 0 |  |
Equity securities | Domestic |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 0 | 0 |  |
Equity securities | International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 0 | 0 |  |
Other Investments [Member] | Private Equity and Real Estate |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Unfunded commitments to limited partnerships |  |  | 2,546 |  |  |
Other Investments [Member] | Domestic | Hedge Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 0 | 0 |  |
Other Investments [Member] | Domestic | Risk Parity Funds [Domain] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 |  | 0 |  |
Other Investments [Member] | Domestic | Structured Products |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 | 0 | 0 |  |
Other Investments [Member] | Domestic | Structured Products [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 0 |  |  |
Other Investments [Member] | International [Member] | Other |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | 0 | 0 |  | 0 |  |
Other Investments [Member] | International [Member] | Structured Products |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | $ 0 | 0 |  | 0 |  |
Employee Defined Contribution Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Contributions charged to expense |  |  | 119 | 111 | 104 |
Pension and postretirement benefit expense |  | $ 4 | 23 |  |  |
Defined Contribution Money Purchase Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Contributions charged to expense |  |  | $ 91 | $ 82 | $ 83 |
UPS/IBT Full-Time Employee Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Liability, Defined Benefit Pension Plan |  |  |  |  |  | $ 4,000
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
Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 3.00% |  |  |
Minimum | U.S. Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Postretirement medical plans service minimum eligibility year |  |  | 10 years | 10 years |  |
Postretirement medical plans service minimum eligibility age |  |  | 55 years |  |  |
Minimum | Domestic | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 0.00% | 0.00% | 0.00% | 0.00% |  |
Minimum | International [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 0.00% | 0.00% | 0.00% | 0.00% |  |
Minimum | Fixed Income Securities [Member] | Domestic |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 15.00% | 15.00% | 25.00% | 15.00% |  |
Minimum | Fixed Income Securities [Member] | International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 15.00% | 15.00% | 15.00% | 15.00% |  |
Minimum | Equity securities | Domestic |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 25.00% | 25.00% | 35.00% | 25.00% |  |
Minimum | Equity securities | International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 50.00% | 50.00% | 50.00% | 50.00% |  |
Minimum | Other Investments [Member] | Private Equity and Real Estate |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Redemption notice period, lower limit |  |  | 10 years |  |  |
Minimum | Other Investments [Member] | Domestic | Hedge Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 8.00% | 8.00% | 5.00% | 8.00% |  |
Minimum | Other Investments [Member] | Domestic | Other |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 1.00% | 1.00% | 1.00% | 1.00% |  |
Minimum | Other Investments [Member] | Domestic | Structured Products |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 3.00% | 3.00% | 1.00% | 3.00% |  |
Minimum | Other Investments [Member] | Domestic | Structured Products [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 0.00% | 0.00% | 0.00% | 0.00% |  |
Minimum | Other Investments [Member] | International [Member] | Structured Products |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 0.00% | 0.00% | 0.00% | 0.00% |  |
Minimum | Other Investments [Member] | International [Member] | Structured Products [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 0.00% | 0.00% | 0.00% | 0.00% |  |
Minimum | Employee Defined Contribution Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 5.00% |  |  |
Maximum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 8.00% |  |  |
Maximum | Domestic | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 5.00% | 5.00% | 5.00% | 5.00% |  |
Maximum | International [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 5.00% | 5.00% | 5.00% | 5.00% |  |
Maximum | Fixed Income Securities [Member] | Domestic |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 35.00% | 35.00% | 35.00% | 35.00% |  |
Maximum | Fixed Income Securities [Member] | International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 35.00% | 35.00% | 35.00% | 35.00% |  |
Maximum | Equity securities | Domestic |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 55.00% | 55.00% | 55.00% | 55.00% |  |
Maximum | Equity securities | International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 65.00% | 65.00% | 65.00% | 65.00% |  |
Maximum | Other Investments [Member] | Private Equity and Real Estate |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Redemption notice period, upper limit |  |  | 15 years |  |  |
Maximum | Other Investments [Member] | Domestic | Hedge Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 15.00% | 15.00% | 15.00% | 15.00% |  |
Maximum | Other Investments [Member] | Domestic | Other |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 10.00% | 10.00% | 10.00% | 10.00% |  |
Maximum | Other Investments [Member] | Domestic | Structured Products |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 10.00% | 10.00% | 10.00% | 10.00% |  |
Maximum | Other Investments [Member] | Domestic | Structured Products [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 5.00% | 5.00% | 5.00% | 5.00% |  |
Maximum | Other Investments [Member] | International [Member] | Structured Products |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 17.00% | 17.00% | 17.00% | 17.00% |  |
Maximum | Other Investments [Member] | International [Member] | Structured Products [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) | 10.00% | 10.00% | 10.00% | 10.00% |  |
Maximum | Employee Defined Contribution Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 8.00% |  |  |

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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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