Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail)

v3.6.0.2
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 ($)
Employee
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2007
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Maximum, Percentage     200.00%      
Number of covered persons | Employee 22          
Pension and postretirement benefit expense   $ 4 $ 3,725 $ 1,189 $ 3,040  
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 2021 2021      
Accumulated benefit obligation for pension plans $ 39,488 $ 39,488 $ 39,488 35,320    
Employer contributions 685   2,668 1,229 1,258  
Fair value of plan assets 0 0 $ 0 $ 55    
Plan assets target allocation     100.00% 100.00%    
U.S. Postretirement Medical Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Pension Plan, Liabilities 2,499 2,499 $ 2,499 $ 2,445    
Fair value of plan assets 15 15 15 130 259  
Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions       22    
Postretirement Medical Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions     98 111    
International Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Pension Plan, Liabilities 358 358 358 250    
Fair value of plan assets 1,092 1,092 1,092 1,014 1,042  
Domestic            
Defined Benefit Plan Disclosure [Line Items]            
Fair value of plan assets 0 0 $ 0 $ 6    
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 0 0 $ 0 $ 0    
International [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Fair value of plan assets 0 0 $ 0 $ 49    
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 0 0 $ 0 $ 0    
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 0 0 $ 0 $ 6    
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 0 0 $ 0 $ 0    
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 0 0 $ 0 $ 0    
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 0 0 $ 0 $ 0    
Other Investments [Member] | Private Equity and Real Estate            
Defined Benefit Plan Disclosure [Line Items]            
Unfunded commitments to limited partnerships 1,908 1,908 1,908      
Other Investments [Member] | Hedge Funds            
Defined Benefit Plan Disclosure [Line Items]            
Unfunded commitments to limited partnerships 5 5 $ 5      
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 0 0 $ 0 $ 0    
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            
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 0 0 $ 0 $ 0    
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] 0 0 $ 0      
Other Investments [Member] | International [Member] | Other            
Defined Benefit Plan Disclosure [Line Items]            
Fair value of plan assets [1] 0 0 $ 0 $ 49    
Other Investments [Member] | International [Member] | Structured Products            
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 $ 0 $ 0 $ 0 $ 0    
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%    
Employee Defined Contribution Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Contributions charged to expense     $ 111 $ 104 95  
Defined Contribution Money Purchase Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Contributions charged to expense     $ 82 $ 83 $ 82  
UPS/IBT Full-Time Employee Pension Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Pension Plan, Liabilities           $ 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% 95.00% 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. Postretirement Medical Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Postretirement medical plans service minimum eligibility year     10 years      
Postretirement medical plans service minimum eligibility age     55 years      
Minimum | Other Investments [Member] | Private Equity and Real Estate            
Defined Benefit Plan Disclosure [Line Items]            
Redemption notice period, lower limit     10 years      
Maximum            
Defined Benefit Plan Disclosure [Line Items]            
Defined contribution plan, employer contribution (percentage)     8.00%      
Maximum | Other Investments [Member] | Private Equity and Real Estate            
Defined Benefit Plan Disclosure [Line Items]            
Redemption notice period, upper limit     15 years      
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