Quarterly report pursuant to Section 13 or 15(d)

ASSETS HELD FOR SALE - Additional Information (Details)

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ASSETS HELD FOR SALE - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Jan. 24, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Actuarial gain $ (3,700)            
Defined benefit plan, net actuarial gain (loss) 2,100            
UPS Freight Business | Held-for-sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Divestiture consideration             $ 800
Impairment charges           $ 686  
Impairment charges, net of tax           629  
Goodwill impairment charge           494  
Increase in valuation allowance       $ 66   $ 192  
Increase in valuation allowance, after tax       $ 50      
UPS Freight Business | Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash proceeds $ 848            
Pre-tax gain   $ 0 $ 101   $ 35    
Gain, after tax     $ 77   $ 27