Annual report pursuant to Section 13 and 15(d)

ASSETS HELD FOR SALE - Additional Information (Details)

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ASSETS HELD FOR SALE - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 30, 2021
Jan. 24, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Goodwill impairment charge         $ 494,000,000 $ 0
Defined benefit plan net actuarial loss $ 2,100,000,000     $ (6,500,000,000) (10,100,000,000)  
Disposal Group, Held-for-sale, Not Discontinued Operations | UPS Freight            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestiture of operations 848,000,000 $ 800,000,000        
Asset impairment charges         686,000,000  
Asset impairment charges net of tax         629,000,000  
Goodwill impairment charge         494,000,000  
Valuation allowance     $ 66,000,000   $ 192,000,000  
Valuation allowance, net     $ 50,000,000      
Gain (loss) on disposal 101,000,000     46,000,000    
Gain (loss) on disposal, net of tax $ 77,000,000     $ 35,000,000