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Other comprehensive income (loss) information
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Other comprehensive income (loss) information Other comprehensive income (loss) information
Changes in accumulated other comprehensive income (loss):

millions of Canadian dollars2023 2022 2021 
Balance at January 1(512)(1,177)(1,989)
Postretirement benefits liability adjustment:   
Current period change excluding amounts reclassified
       from accumulated other comprehensive income		(206)582 679 
Amounts reclassified from accumulated other comprehensive income41 83 133 
Balance at December 31(677)(512)(1,177)
Amounts reclassified out of accumulated other comprehensive income (loss) - before-tax income (expense):

millions of Canadian dollars2023 2022 2021 
Amortization of postretirement benefits liability adjustment
       included in net benefit cost (a)
(54)(110)(176)
(a)  This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (note 4).

Income tax expense (credit) for components of other comprehensive income (loss):
millions of Canadian dollars2023 2022 2021 
Postretirement benefits liability adjustments:  
Postretirement benefits liability adjustment (excluding amortization)(66)188 221 
Amortization of postretirement benefits liability adjustment
       included in net benefit cost
13 27 43 
Total(53)215 264