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Investment and other income (Tables)
 3 Months Ended
Mar. 31, 2024
Other Income and Expenses [Abstract]  
Investment and other income
Investment and other income included gains and losses on asset sales as follows:
       Three Months
       to March 31
millions of Canadian dollars2024 2023 
Proceeds from asset sales4 14 
Book value of asset sales2 5 
Gain (loss) on asset sales, before tax
2 9 
Gain (loss) on asset sales, after tax
2 8