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Goodwill
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
(in millions of Canadian dollars)Net carrying amount
Balance as at December 31, 2022
$344 
Additions (Note 8)
17,591 
Foreign exchange impact212 
Balance as at September 30, 2023
$18,147 

Additions to Goodwill in 2023 represents the excess of the purchase price over the estimated fair value of net assets acquired in the business acquisition of KCS. The goodwill represents future growth opportunities, synergies and an assembled workforce.