Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
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
[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjBjMjdiZjQ4NGExMjQxZDVhMTQ5ODAzM2FjMzk5MTdifFRleHRTZWxlY3Rpb246N0ZBQ0U2REM1N0U4MDkxNjA1ODRCNTk5NUMyNDRDMjIM}
[2] Represents mortgage and asset-backed securities.