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GOODWILL AND INTANGIBLE ASSETS - Summary of Change in the Carrying Amount of Goodwill by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Balance beginning of period $ 8,508 $ 8,587
Additions 215 35
Disposals (4)  
Foreign currency impact 61 (114)
Balance end of period 8,780 8,508
Freight Segment    
Goodwill [Roll Forward]    
Balance beginning of period 7,085 7,073
Additions 215 35
Disposals (4)  
Foreign currency impact 16 (23)
Balance end of period 7,312 7,085
Transit Segment    
Goodwill [Roll Forward]    
Balance beginning of period 1,423 1,514
Additions 0 0
Disposals 0  
Foreign currency impact 45 (91)
Balance end of period $ 1,468 $ 1,423