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Goodwill
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
(in millions of Canadian dollars)
Balance as at December 31, 2022$344 
Addition (Note 10)17,565 
Foreign exchange impact(180)
Balance as at December 31, 202317,729 
Addition (Note 10)67 
Foreign exchange impact1,554 
Balance as at December 31, 2024$19,350 

Additions to goodwill in 2023 and 2024 represent the excess of the purchase price over the fair value of the net assets acquired in the business acquisition of KCS, including adjustments arising in the measurement period. The goodwill represents synergies and an acquired assembled workforce.