Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details)

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GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]            
Acquired       $ 21,000,000    
Goodwill   $ 4,350,000,000   4,350,000,000   $ 4,872,000,000
Indefinite-lived intangible assets   4,000,000   4,000,000   93,000,000
Carrying value   3,102,000,000   3,102,000,000   3,212,000,000
Impairment of finite lived intangible assets   0 $ 0 48,000,000 $ 0  
Impairment of finite lived intangible assets, after tax       $ 35,000,000    
Goodwill impairment effect on earnings per share (in dollars per share)       $ 0.04    
Capitalized software            
Finite-Lived Intangible Assets [Line Items]            
Carrying value   1,893,000,000   $ 1,893,000,000   1,939,000,000
Impairment of finite lived intangible assets       7,000,000    
Trade name            
Finite-Lived Intangible Assets [Line Items]            
Carrying value   89,000,000   89,000,000   $ 142,000,000
Impairment of finite lived intangible assets       41,000,000    
Global Freight Forwarding, Coyote and Roadie            
Finite-Lived Intangible Assets [Line Items]            
Goodwill   1,100,000,000   1,100,000,000    
UPS Stores            
Finite-Lived Intangible Assets [Line Items]            
Acquired       6,000,000    
MNX Global Logistics and Happy Returns            
Finite-Lived Intangible Assets [Line Items]            
Acquired $ 15,000,000          
Discontinued Operations, Held-for-Sale | Coyote            
Finite-Lived Intangible Assets [Line Items]            
Goodwill   494,000,000   494,000,000    
Indefinite-lived intangible assets   89,000,000   89,000,000    
Carrying value   $ 104,000,000   $ 104,000,000