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Goodwill
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
(in millions of Canadian dollars)
Balance as at December 31, 2021$328 
Foreign exchange impact16 
Balance as at December 31, 2022344 
Addition (Note 11)
17,565 
Foreign exchange impact(180)
Balance as at December 31, 2023$17,729 

Addition to goodwill in 2023 represents the excess of the purchase price over the estimated fair value of the net assets acquired in the business acquisition of KCS. The goodwill represents synergies and an acquired assembled workforce.