Annual report pursuant to Section 13 and 15(d)

GOODWILL AND INTANGIBLE ASSETS - Allocation of Goodwill by Reportable Segment (Details)

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GOODWILL AND INTANGIBLE ASSETS - Allocation of Goodwill by Reportable Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]      
Balance at beginning of year $ 4,223,000,000 $ 3,692,000,000  
Acquired 727,000,000 596,000,000  
Impairments (125,000,000)    
Currency / Other 47,000,000 (65,000,000)  
Balance at end of year 4,872,000,000 4,223,000,000 $ 3,692,000,000
Operating Segments      
Goodwill [Line Items]      
Impairments   0 0
U.S. Domestic Package | Operating Segments      
Goodwill [Line Items]      
Balance at beginning of year 847,000,000 847,000,000  
Acquired 0 0  
Impairments 0    
Currency / Other 0 0  
Balance at end of year 847,000,000 847,000,000 847,000,000
International Package | Operating Segments      
Goodwill [Line Items]      
Balance at beginning of year 492,000,000 403,000,000  
Acquired 4,000,000 105,000,000  
Impairments 0    
Currency / Other 7,000,000 (16,000,000)  
Balance at end of year 503,000,000 492,000,000 403,000,000
Supply Chain  Solutions | Operating Segments      
Goodwill [Line Items]      
Balance at beginning of year 2,884,000,000 2,442,000,000  
Acquired 723,000,000 491,000,000  
Impairments (125,000,000)    
Currency / Other 40,000,000 (49,000,000)  
Balance at end of year $ 3,522,000,000 $ 2,884,000,000 $ 2,442,000,000